CMA4875 Crydom - Relays

CMA4875 Description

Crydom makes the CMA4875, 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 CMA4875 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 CMA4875 is a 75 A panel-mount solid state relay, CMD/CMA48 Series (48-530 VAC), SCR output, AC control (90-140 Vrms), zero-cross turn-on, LED input indicator, IP20 touch-safe housing with box-clamp terminals. Source: Crydom CMD/CMA48 Series datasheet (Rev. 113011). Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-63 Hz)	48-530 Vrms
Maximum load current	75 Arms
Transient overvoltage	1200 Vpk
Minimum load current	0.25 Arms
Maximum 1 cycle surge current (50/60 Hz)	954/1000 Apk
Maximum on-state voltage drop @ rated current	1.6 Vpk
Maximum off-state leakage @ rated voltage	10 mArms
Minimum off-state dv/dt	500 V/µs
Thermal resistance junction to case (Rjc)	0.31 °C/W
Maximum I²t for fusing (1/2 cycle, 50/60 Hz)	4555/4150 A²s
Switching type	zero-cross turn-on
Input
Control voltage range	90-140 Vrms
Minimum turn-on / turn-off voltage	90 Vrms / 10 Vrms
Typical input current	15 mA @ 120 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)	3.0 oz (86.5 g)

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