C Family of Solid State Contactors --
The new standard for industrially hardened, AC-1 and AC-3 solid state contactors -- Updated 2023


  • 2 switching channels for up to 100 amps per leg
  • Dual independent VDC inputs OR one 0-10 VDC analog input
  • 0-10 VDC analog input provides 1 second PWM ON/OFF/ON/OFF control or high speed PWM with advanced half cycle control (8.3 msec)
  • ALERT diagnostics output -- SCR health, SCR problem, load open, external fuse open, broken wire, and thermal problems
  • Two independent channels OR install it as a 2 pole contactor
  • SMALL -- only 80 mm by 176 mm (~3x7 inches)
  • Maximum Surge Survival™ technology -- triple layer, voltage surge protection
  • New heat sink, in 2023, is 18% more effective
  • Bolt on installation bracket is standard. An optional din-rail bracket can be added.
  • Heater contactor, lighting contactor, or motor starter
  • Modular design for flexibility in stocking, installing, and maintaining
  • Green LEDs for input status, red LEDS for ALERT status
  • Built-in snubber circuit and MOVs
  • Built in temperature monitor and temperature shutdown circuit
  • Precise zero crossing switching -- lowest EMI, lowest noise to nearby electronics
  • 4000 volt isolation, 1400 volt blocking voltage, 1500 max amperage for one sinewave
  • Industry standard L1, T1, L2, T2, A1, A2, B1, B2 terminal numbers
  • High density design permits more amps per square inch of installation area
  • REAL POWER switching channels, up to 100 amps each, are each only 1.6 inches wide
  • Designed and built in the USA
solid state relay -- C Family

2 pole contactor

solid state relay schematic

C family derating

Din Rail Clip attached

Part Number

CZ2H-IDC2   Solid State Contactor, 2 channels at up to 100 amps per channel, 480V max, DC control input. Includes heat sink. Buy

DIN RAIL CLIP   Clips onto a standard 35 mm din rail Buy

CZ-JUMPER   Convert from dual pulsing inputs to one 0-10 VDC analog input. Buy

CZ-INPUT RESISTOR   Convert from a 4-20mA signal from a temperature controller or PLC. 1) Change controller to a 0-20mA, 2) then add this resistor at the controller, across the 0-20mA terminals. This is a 499 ohm, 0.1%, 0.5 watt resistor such as a DigiKey RNF12BTE499RCT-ND Buy

CZ2H-IDC2-A02   Solid State Contactor "Top Hat" assembly. This is the electronic section of the CZ2H product ONLY. Customer to supply own heat sink. Example: for replacement purposes, for large applications (100-500 zones) using a large external heat sink, or military applications when installed directly to the ship or vehicle's frame.Buy Always use Thermal Transfer Compound (Thermal Grease) when installing a "A02" Top Hat assembly onto a heat sink.

For additional information and complete product specifications, please see the four page: C Family Solid State Contactor Data Bulletin. For simplified wiring information and ALERT wiring information, visit: control input and ALERT wiring. For high amperage inrush applications (motor starters, municipal lighting, stadium lighting, etc.) confirm that the maximum amperage requirements for the load is less than 180 amps for 2 seconds.

Part Number Line Voltage Range (VAC) Load Current Range (A RMS) Min Control Voltage & Current Draw Max Control Voltage & Current Draw
CZ2H-IDC2 24-480 .25-100 per channel 3vdc/2mA 32vdc/2mA
0-10VDC analog input By inserting a jumper, the CZ2H-IDC2 will now accept a 0-10 VDC analog control input and convert that information to ON/OFF/ON/OFF outputs on both channels. The outputs will be based upon a 1 second total cycle time (for many resistive loads) OR will be based upon half cycles (for fast responding loads, IR lamp loads, etc).
Diagnostics output The ALERT output will activate upon: SCR #1 failed open or closed, SCR #2 failed open or closed, SCR incapable of switching (OK now, but can not switch when commanded), no incoming power (open fuse), no outbound power (open load), and thermal shutdown. The "incapable of switching ALERT" is a Power-io exclusive feature. For example: a dropped tool momentarily shorts the load during a machine change-over. The machine starts OK and the loads are ON during start up. The ALERT activates because the SCR is damaged and is incapable of future switching as requested.
The standard diagnostics range is for a line voltage of 100 - 480 VAC. Contact Power-io for diagnostics outside this voltage range.
Off-State dv/dt >3000 v/µs
Isolation 4000 volts isolation: Line to control input 1; Line to control input 2, Line to base
I²T fuse 100A or less, for example: Bussman FWP-100A22F, or smaller. High inrush loads, motors, incandescent lights, stadium lighting may be able to use higher I²T fuses, under certain circumstances. Contact Power-io before using any I²T fuse greater than 100 amps.
Internal MOVs Power MOVs rated at 575 VAC, 220 Joules, 8/20 microseconds
Turn-on time One sinewave max, max imbalance delay 1/2 sinewave when used with 3-32 VDC inputs
Turn-off time One sinewave max, max imbalance delay 1/2 sinewave when used with 3-32 VDC inputs
Turn-on / off time When used with the 0-10 VDC analog input, minimum time is 1 half sinewave ON, 2 half sinewaves OFF. Noise free zero-crossing control is used.
Power terminals Will accept #8- #2 AWG wire. Torque: 40-50 inch lbs.
Control terminals Will accept #24- #12 AWG wire. Torque: 3-6 inch lbs.