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SSR

Solid State Relay Modules

The SSR series modules incorporate solid-state relays to provide reliable switching of loads with high inrush-current and to work in applications with rapid duty cycle operation or a large number of total operations.

The SSRZ series modules are zero-cross switching relays providing the ultimate switching solution for many kinds of loads series is the ultimate in cost efficient switching and employ an industry-standard relay that performs billions of operations each day in industrial and commercial control systems. It is intended for general purpose light to normal duty applications and is also well suited as pilot relay for larger external relays and contactors.

The SSRP series feature a unique solid-state relay specifically developed to switch inductive-reactive loads like magnetic transformers and ballasts. These relays will provide initial peak switching at turn-on and subsequent zero-cross switching to greatly reduce in-rush current to magnetic devices.

The SSRZ and SSRP modules, as the rest of the unique PWR Series, were designed for exceptional reliability and durability under demanding circumstances. The PWR Series is a dimming and power control system for distributed installation in environments ranging from theme parks and theatres to sophisticated commercial, corporate, and public buildings. It’s modularity and extensive features facilitate an unmatched selection of cost effective solutions to numerous control tasks in a wide variety of applications including lighting control and energy management. The PWR Series provides unparalleled versatility and scalability with a comprehensive range of controllers, dimmers, switching modules, and enclosures with or without integral circuit breakers.

Specifications
SSRZ20/1, SSRZ20/2, SSRZ50, SSRP20/1 & SSRP20/2

1.  The switching modules shall be the PWR Series SSRZ20/1, SSRZ20/2, SSRZ50, SSPR20/1, or SSRP20/2 as required by the circuit layout and load type.

2.  The modules shall employ single pole, single throw, normally open, (SPST-NO) alternate current (AC) solid-state relays. Electro-mechanical relays, mercury relays, or devices utilizing triacs shall not be acceptable.

3.  The SSRZ modules shall provide zero-cross switching. Devices not providing this mode of operation shall not be acceptable.

4.  The SSRP modules shall provide initial peak switching at turn-on and subsequent zero-crossing switching to minimize inrush-current for inductive-reactive loads e.g. magnetic transformers and ballasts. Devices not providing this mode of operation shall not be acceptable.

5.  The solid-state relays shall incorporate a pair of silicon controlled rectifiers (SCR) mounted in anti-parallel configuration, snubber network, gate drive circuitry, and an opto-isolator in an industry-standard 1.80" x 2.30" package. Proprietary SCR packages shall not be acceptable.

6.  The SCRs for 20A relays shall have a minimum nominal rating of 40A at 277VRMS, withstand peak impulse voltages of minimum 600V and surge currents of minimum 625A for no less than 16.6mS. The SCRs for 50A relays shall have a minimum nominal rating of 75A at 277VRMS, withstand peak impulse voltages of minimum 600V and surge currents of minimum 1000A for no less than 16.6mS.

7.  The module load circuit surge and transient withstand capability shall meet or exceed the minimum recommendations of ANSI C64.21-1991. Continuous breakdown voltage between control terminals, load terminals, and ground shall be no less than 4000V.

8.  On-state voltage drop shall not exceed 1.6V at full rated current.

9.  Off-state leakage current shall not exceed 10mA at full rated voltage.

10.  Line and load terminals shall accept up to #8AWG wire for 20A modules and up to #6AWG wire for 50A modules. Control wiring shall be provided by a 24" harness factory terminated in a 4 position keyed plug-in header.

11.  The modules shall be convection cooled only. An aluminum heat-sink, that forms the main structural member of the module, shall provide no less than 185 square inches of cooling surface for the 20A modules and no less than 370 square inches of cooling surface for the 50A module. Devices utilizing fans or other forced cooling methods shall not be acceptable.

12.  The modules shall be UL listed for continuous operation at 100% of their rating per NEC 1999 Article 210-20-a. Systems failing to meet this requirement shall not be acceptable.

13.  The modules including their wiring, termination points, mounting hardware, enclosure and controller shall be UL and cUL listed as a complete assembly and for Canadian installations comply with CSA Standard C22.2 #14-M91. UL recognized or listed devices alone shall not be acceptable unless documentation is submitted to verify that the entire assembly, including the controller and enclosure, has been tested and evaluated by a Nationally Recognized Testing Laboratory (NRTL) and found to meet all the herein-mentioned standards and requirements.

14.  The modules shall be listed with the following minimum UL and cUL ratings at 40° C ambient temperature: