HA4875 Crydom - Relays

HA4875 Description

Crydom makes the HA4875, a 480 V, 75 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 HA4875 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 HA4875 is a 75 A panel-mount solid state relay, HA/HD48 Series (48-530 VAC), SCR output, AC control (90-280 VAC), 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	75 Arms
Transient overvoltage	1200 Vpk
Minimum load current	150 mArms
Maximum 1-cycle surge current (50/60 Hz)	954/1000 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)	4555/4150 A²s
Thermal resistance junction to case (Rjc)	0.3 °C/W
Switching type	zero voltage turn-on
Input
Control voltage range	90-280 Vrms
Minimum turn-on voltage	90 Vrms
Must turn-off voltage	10 Vrms
Input current	5-10 mA
Maximum turn-on / turn-off time	20 ms / 30 ms
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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