HD4812 Crydom - Relays

HD4812 Description

Rated at 480 V and 12 A, the Crydom HD4812 is a solid state relay. It is widely used for heater control, motor switching, lighting and process equipment where mechanical contacts would wear out.

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Summary of Features

Target Applications

Crydom HD4812 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 HD4812 is a 12 A panel-mount solid state relay, HA/HD48 Series (48-530 VAC), SCR output, DC control, zero voltage turn-on. Source: Crydom HA/HD48 Series datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-440 Hz)	48-530 Vrms
Maximum load current	12 Arms
Transient overvoltage	1200 Vpk
Minimum load current	150 mArms
Maximum 1-cycle surge current (50/60 Hz)	134/140 Apk
Maximum on-state voltage drop @ rated current	1.15 Vrms
Maximum off-state leakage @ rated voltage	1 mArms
Minimum off-state dv/dt	500 V/µs
Maximum I²t for fusing, 1/2 cycle (50/60 Hz)	66/60 A²s
Thermal resistance junction to case (Rjc)	1.03 °C/W
Switching type	zero voltage turn-on
Input
Control voltage range	4-32 VDC
Minimum turn-on voltage	4.0 VDC
Must turn-off voltage	1.0 VDC
Input current	7-12 mA
Maximum turn-on / turn-off time	1/2 cycle / 1/2 cycle
General
Dielectric strength, input/output/base	4000 Vrms
Ambient operating temperature	-40 to 80°C
Weight (typical)	2.6 oz (74.9 g)

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