A4812 Crydom - Relays

A4812 Description

The A4812 is a solid state relay made by Crydom. It is widely used for heater control, motor switching, lighting and process equipment where mechanical contacts would wear out.

USComponent (Young & New Century LLC) supplies power modules, thyristors, diodes and other industrial components, including legacy parts. Contact us for a quote on the A4812, and please confirm ratings against the datasheet before ordering.

Summary of Features

Target Applications

Crydom A4812 is used for switching AC loads in industrial heating and temperature control (ovens, furnaces, plastic molding and extrusion machines), packaging and food processing equipment, lighting control, HVAC systems and industrial automation.

Key Specifications

Crydom A4812 is a 12 A Series 1 480 VAC panel-mount solid state relay, SCR output, 80-530 VAC, AC control 90-280 Vrms (60 Hz). Source: Crydom Series 1 480 VAC datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-63 Hz)	80-530 Vrms
Maximum load current	12 Arms
Minimum load current	40 mArms
Transient overvoltage	800 Vpk
Maximum surge current (16.6 ms)	140 Apk
Maximum on-state voltage drop @ rated current	1.7 Vpk
Thermal resistance junction to case (Rjc)	1.48 °C/W
Maximum I²t for fusing (8.3 ms)	81 A²s
Maximum off-state leakage @ rated voltage	10 mArms
Minimum off-state dv/dt	500 V/µs
Input
Control voltage range	90-280 Vrms (60 Hz)
Maximum turn-on / minimum turn-off voltage	90 / 10 Vrms
Typical input current	2.0 mA @ 120 Vrms, 4.0 mA @ 240 Vrms
Maximum turn-on / turn-off time	10 ms / 40 ms
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-40 to 80°C
Weight (typical)	3 oz (86.5 g)

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