Watlow Solid State Relays

Sords Electric Sells Watlow Solid State Relays

Buy Watlow SSRs HERE!

The power controller is a discrete output device that regulates your system with guidance from the temperature controller. There are three common power controllers: electromechanical relays, solid-state relays and silicon-controlled rectifiers (SCRs).

Watlow solid state relays (SSR) offer many of the advantages of solid state power controllers, but at a lower cost. Watlow's extensive knowledge in power controller design led to the development of a special fast cycle input card that enables a solid state relay to operate from a standard 4-20mA instrumentation command signal. Test results show that zero-cross solid state relays in combination with the fast cycle card promote better temperature control and longer heater life than slow cycle relays. Through a time proportional cycle rate of 1⁄10 of a second, heater life will be extended.

Both low and high voltage solid state relays are available from 24 to 660VAC. All ac output models include back-to-back silicon controlled rectifiers (SCRs) for a more rugged design than the traditional triac-based solid state relay. The internal design allows it to tolerate high currents and harsh electrical environments of heavy industry. Watlow also offers a switched VDC model for dc heating applications.

Watlow provides all of the components necessary for trouble-free operation. This includes two standard convenience items: a thermal foil to ensure proper thermal transfer from the relay to the heat sink and belleville washers to ensure that the relay is mounted with sufficient pressure to enable good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

Watlow SSR Solid State Relay

SSR-480-75A-AC1

AC input, 75 Amps

SSR-480-50A-AC1

AC input, 50 Amps

SSR-480-25A-AC1

AC input, 25 Amps

SSR-480-75A-DC1

DC input, 75 Amps

SSR-480-50A-DC1

DC input, 50 Amps

SSR-480-25A-DC1

DC input, 25 Amps

SSR-240-50A-DC1

DC input, 50 Amps

SSR-240-25A-DC1

DC input, 25 Amps

SSR-240-10A-DC1

DC input, 10 Amps

Relays may need to be deRated based on ambient temperature or how and where they are mounted. The rule of thumb is to only switch 80% of the amp rating.

For three phase use, please use 3 relays, one per phase.

UL recognized File #151484 and #E73741 CSA certified up to 600VAC, File #LR700195 VDE 60950 License # 40021401, File #1995500 up to 480VAC, CE

Buy Watlow SSRs HERE!

Sords Electric
Cleveland, Ohio
www.sordselectric.com

Diversified Electronics TSF Solid State Repeat Cycle Timer

Sords Electric Sells the TSF Repeat Cycle Timer (Off time first) by Diversified.

For a Quote, please click HERE!

About the TSF Repeat Cycle-OFF Time First Solid-State Output Timer from ATC Diversified Electronics:

Application of voltage to the input of the timer initiates the OFF time. Upon completion of the OFF time, the load energizes and the ON time begins. Upon completion of the ON time, the load de-energizes and one cycle is completed. This OFF/ON cycling continues until voltage is removed from the input. The OFF/ON time periods are independently adjustable. 

Features:

• Voltage to input initiates the off time
• OFF/ON times independently adjustable

Diversified / ATC TSF
Repeat Cycle Timer
Off Time first

OPERATION: Application of voltage to the input of the timer initiates the OFF time. Upon completion of the OFF time, the load energizes and the ON time begins. Upon completion of the ON time, the load de-energizes and one cycle is completed. This OFF/ON cycling continues until voltage is removed from the input. The OFF/ON time periods are independently adjustable.

Solid-state, SPST-N.O. 

1 amp resistive; RATING 

1 amp 25VA @ 24VAC 

1 amp 125VA @ 120VAC 

 .5 amp 125VA @ 240 VAC

Part Numbers

TSF24AFC, 24 volts, fixed Timing

TSF120AFC, 120 volts, fixed timing

TSF240AFC, 240 volts, fixed timing

TSF24ARC, 24 volts, Adjustable Timing

TSF120ARC, 120 volts, Adjustable timing

TSF240ARC, 240 volts, Adjustable timing

For a Quote, please click HERE!

Sords Electric

216-765-4230

www.sordselectric.com

Littelfuse SE-134C Series - Ground-Fault Ground-Check Monitor

Littelfuse SE-134C and SE-135 Ground Fault Monitor

from Sords Electric

The Littelfuse SE-134C/SE-135 is a microprocessor-based, combination ground-wire monitor and ground-fault relay for resistance-grounded or solidly grounded systems. It continuously monitors the integrity of the ground conductor to protect portable equipment from hazardous voltages caused by ground faults. The Littelfuse SE-134C/SE-135 is field proven in monitoring trailing cables on large mobile equipment such as drag-lines, mining shovels, shore-to-ship power cables, dock-side cranes, stacker-reclaimers, submersible pumps, and portable conveyors.

To get a quote, please click HERE!

Features & Benefits

Adjustable pickup (0.5 - 12.5 A for SE-CS10)(2 - 50 A for SE-CS40) 

Unit can be used on a wide variety of trailing cable applications 

 

Adjustable time delay(0.1 - 2.5 s) 

Adjustable trip delay for quick protection and system coordination 

 

Output contacts 

Separate annunciation of ground-fault and ground-check faults

 

Ground-check LED indication 

Indication of open or short ground-check wire makes it easier to find faults

 

CT-loop monitoring

Alarms when CT is not connected

 

High-induced-ac rejection 

Makes unit suitable for applications with high voltages and long cables 

 

DFT (Harmonic) filter 

Prevents false operation

 

Zener-characteristic termination assembly 

Provides reliable ground-check loop verification 

 

Fail-safe circuits 

Ensures ground-check and ground-fault circuits remain safe even in the event of equipment failure 

 

Conformal coating 

Additional coating protects circuit boards against harsh environment 

 

XGC option

Increases maximum cable length for ground-check monitoring (10 km typical)

 

Littelfuse Ground Fault Check Monitor

 - SE-134C & SE-135

 

 

 

 

 

 

 

 

Specifications

IEEE Device Numbers     Checking or Interlocking Relay (3GC), Ground fault (50G/N, 51G/N)

Input Voltage   65-265 V ac; 85-275 V dc; 18-72 V dc 

Dimensions   H 213 mm (8.4"); W 99 mm (3.9"); D 132 mm (5.2"); 

Trip Level Settings   0.5-12.5 A for SE-CS10, 2 - 50 A for SE-CS40 

Trip Time Settings   0.1-2.5 s 

Contact Operating Mode   Selectable fail-safe or non-fail-safe

Harmonic Filtering   Standard feature 

Test Button     Standard feature 

Reset Button   Standard feature

Output Contacts   Isolated Form A and Form B, Two Form C 

Approvals    CSA certified, UL Listed (E340889), RCM (Australia)(3), CE(3) 

Conformally Coated    Standard feature 

Warranty   5 years 

Mounting   Panel, Surface  

GC Trip Resistance   28 Ω (Standard), 45Ω (XGC Option)

Accessories

SE-CS10 or SE-CS40 Series Ground-Fault Current Transformer 

Required zero-sequence current transformer detects ground-fault current.

 

SE-TA6A Series, SE-TA12A Series Termination Assembly 

Required termination assembly; temperature compensated.

 

Part Numbers:

Littelfuse SE-134C00  120/240 AC/DC 

Littelfuse SE-134C10  24/48 VDC

Littelfuse SE-134CXGC00  120/240 AC/DC

Littelfuse SE-134CXGC10  24/48 VDC 

Littelfuse SE-13500  120/240 AC/DC

Littelfuse SE-135XGC00  120/240 AC/DC

Littelfuse SE-13503  120/240 AC/DC & Ethernet

Littelfuse SE-135XGC03  120/240 AC/DC & Ethernet

Littelfuse SE-13510  24/48 VDC

Littelfuse SE-135XGC10  24/48 VDC

Littelfuse SE-13513  24/48 VDC & Ethernet

Littelfuse SE-135XGC13  24/48 VDC & Ethernet

To get a quote, please click HERE!

Sords Electric

216-765-4230

www.sordselectric.com

Littelfuse SE-134C...Littelfuse SE-135...Littelfuse SE-134C...Littelfuse SE-135

Littelfuse SE-703 Earth-Fault Relay for Protection

  Littelfuse SE-703 Earth Fault Protection for plants and machines

For a Quote, click HERE!

The SE-703 is a microprocessor-based ground-fault relay for resistance and solidly-earthed systems. It offers sensitive ground-fault detection as low as 25 mA and can be used on systems with significant harmonic content. The SE-703 provides feeder-level protection or individual-load protection. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter. The SE-703 is specifically designed to be Australian AS/NZS 2081 compliant.

Operates on AC solidly grounded and AC resistance grounded systems.

Littelfuse SE-703 Fault Meter

The Littelfuse SE-703 requires an EF Current Transformer

The SE-703 Specifications are:

Input voltages: 24, 120, 240 AC and 12, 24, 48 DC

Dimensions: 3x2.2x4.5 inches

Trip Level: 25-500mA

Trip Time: INST - 500 ms

Contact Operating Mode: Fail-Safe

Contacts: Isolated Form A and Form B

Analog Output: 0-5 V

Reset and Test Buttons provided

Approvals: CE, UL, CSA, C-Tick

Littelfuse SE-703 Part Numbers are:

SE-703-OU   120/240 VAC or VDC control power

SE-703-OD   12/24 DC control power

SE-703-OT   48 DC control power

SE-703-OU   24 VAC control power

Accessories:

EFCT Series Current Transformer Required

PGA-0500 Analog % current meter

PMA-55 or PMA-60 Panel mounting adapters

SE-EFVC voltage clamp

For a Quote, click HERE!

Sords Electric

Cleveland, Ohio

216-765-4230

www.sordselectric.com

Littelfuse SE-703...Littelfuse SE-703...Littelfuse SE-703...Littelfuse

Littelfuse SE-701 Ground Fault Monitor

 Littelfuse SE-701 Ground Fault Protection for plants and machines

For a Quote, click HERE!

The Little Fuse SE-701 is a microprocessor-based ground-fault relay for resistance and solidly-grounded systems. In addition to common systems, it is uniquely suited for use on systems with significant harmonic content. The SE-701 can provide main-plant protection, feeder-level protection, or individual-load protection. Proper current transformer selection provides the desired pickup range. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter.

Littelfuse SE-701 Ground Fault Protection Meter

The Littelfuse SE-701 requires a Current Transformer

The SE-701Specifications are:

Input voltages: 24, 120, 240 AC and 12, 24, 48 DC

Dimensions: 3x2.2x4.5 inches

Trip Level: 1-99% of Primary rating

Trip Time settings: .05 - 2.5 seconds

Contact Operating Mode: Either Fail-Safe or Non Fail-Safe

Contacts: Isolated Form A and Form B

Analog Output: 0-5 V

Reset and Test Buttons provided

Approvals: CE, UL, CSA, C-Tick

Littelfuse SE-701 Part Numbers are:

SE-701-OU   120/240 VAC or VDC control power

SE-701-OD   12/24 DC control power

SE-701-OT   48 DC control power

SE-701-OU   24 VAC control power

Accessories:

Current Transformer (application specific)

PGA-0500 Analog % current meter

PMA-55 or PMA-60 Panel mounting adapters

SE-EFVC voltage clamp

For a Quote, click HERE!

Sords Electric

Cleveland, Ohio

216-765-4230

www.sordselectric.com

Littelfuse SE-701...Littelfuse SE-701...Littelfuse SE-701...Littelfuse

Selecting Solid State Relays

Sords Electric Sells SSRs or Solid State Relays
Selecting the right relay is important for long life and application efficiency.

BUY SSRs HERE!

Here is guide to selecting and installing (SSRs) Solid State Relays.

A solid state relay or SSR is an electronic device that switches loads on or off when an external voltage or signal is applied to its control terminals. The lack of moving parts in an SSR allows it to switch much faster that electromechanical relays while avoiding the creation for electrical arcs. Solid Sate Relays are also silent, so users won't be subjected to the annoying noise associated with electromechanical relays. Furthermore, because SSRs have no moving parts or contacts that can wear out, SSRs last longer and require less maintenance than electromechanical relays.

SSRs are used in a variety of applications where quick, silent switching is advantageous. Some of these industries include: plastics/rubber, Food and beverage, processing, packaging, HVAC, semiconductor, oil/gas, transportation, conveyors, power or energy systems, printing, laboratory,kiln/oven, lighting, medical/pharmaceutical, and motion control.

How will your solid state relays be mounted/installed?

SSRs are available in a few mooting configurations. Printed circuit board (PCB) mont SSRs are limited in load size due to electric creepage and clearance distance and heat dissipation constraints.
Chassis munt SSRs are often installed to a back panel of an electrical panel but may also mount directly to a metal surface within a machine or appliance. Typically, the SSR can be mounted without a heat sink if the load is un 5 amps or under 8 amps if the mounting surface is an unpainted metal plate. To achieve the desired maximum SSR output rating, a sink sink must be properly sized and installed along with the SSR.

Engineers wo tont want to worry about properly sizing and mooting a heat sink can opt for an SSR with an integrated heat sink. These typically snap directly onto the DIN rail and are ready to wire up and use. Many of the more advanced Ssts, such as those enabling proportional control, are available in this design.  Is it also easier to obtain agency approval with SSRs integrated heat sinks, which are typically cUL listed and carry horse power ratings.

How Many Poles Need to be Switched?

When selecting a Solid State Relay, you will need to know how many polkas  (or lines of voyage) are to be switched to the load.  If your application uses a DC load, you'll need a one pole DC switching SSR. For a single-phase AC load you'll need a one pole AC switching SSR.  For a three phase AC load, you'll need to determine if you want to switch all three poles to the load or if you can get by with only switching 2 poles.  This can be achieved with a two-pole or three-pole three phase switching SSR.

What is Your Load Voltage and Current?

You will need to determine the maximum AC or DC voltage and current for your load. These variables are typically found on the specification of your motor, heater or other electrical device. For AC loads, SSRs usually switch on phase at 120 or 240 VAC or for three phase applications: 208, 240, 480 or 600 VAC.  Also factor in any potential power sags or surges in the application location when determining the minimum and maximum load voltage. DC loads are gong to be powered by DC voltage.
For motors, you will need to know the maximum horse power or kilowatt rainy at the respective voltage of your application. Check for these specs on the motor name plate.

What is the control voltage or input signal to turn the SSR on?

Next you'll need to determine another kind of voltage, the pick-up voltage that is required to energize your load as its turn off voltage (at which your load will de-energize). These are the critical control voltages for your SSR, and are usually found on your loads spec sheet. Unlike electromechanical relays or contractors which typically are controlled by a fixed voltage, SSrs have input ranges either VDC or dual VAC/VDC.
If you wish to proportionally control your load, you'll need some additional specs to choose the proper SSR. Proportional control is typically done with a 0-5, 1-5 or 0-10 VDC input or a 4-20mA control signal. Be sure to consult with a SSR manufacturer to determine the optimum out-put switching type for your load application, as it can get a bit sophisticated. Proportional output types include phase angle, distributed full cycle, burst full cycle, soft start and burst full cycle with soft start.

What is the Ambient temperature where the SSR will be installed or located?

The maximum SSR current rating depends upon the ambient temperature where is will be used and installed. Heightened temperatures can reduce the SSRs current rating.  Any SSRs are mounted on a chassis and require a heat sink t ptomaine their performance. you will need to know the ambient temperature, as well as the mounting orientation upfront, to properly ensure the right type of heat sink is specified.  Highly competent SSR manufacturers provide online tools to help match single or multiple SSRs with the appropriate heat sink. With Din rail mountable SSRs the heat sink is already integrated and the ratings are typically listed on the side of the device or data sheet for various ambient temperatures.  Keep in mind that higher ambient temperatures will require you to de-rate the current rating of the Solid State Relay.


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Sords Electric
216-765-4230

MDI Mercury Relay FAQs

MDI Mercury Displacement Industries Mercury Relays

Quick FAQs and Answers

What are the advantages of Mercury relays over Solid State Relays in A.C. Resistive heating application?

Mercury Relays have a Longer trouble free life, cost effective, they have a greater immunity to voltage spikes, lower voltage drops and less heat generated by the units then Solid State Relays.

What is the difference between Resistive and General Purpose?

Resistive has a Power Factor of one and usually used in A.C. resistive heating.
General Purpose is a UL designation for loads with a Power Factor of 0.7 or higher.

What is the average life of a relay?

At full contact ratings, the relays tend to last several million operations. Running at lower voltages and currents can add greatly to the life expectancy.

 What is a Liquid Level Control?

The most common liquid level control is the sump pump float. Our floats can be used to control the levels of many other fluids too. The sump pump float is designated a normally open or pump down. We also make normally closed or pump up floats to control the addition of liquid to keep and tank from going empty.

Sords Electric

216-765-4230

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