CMRA4855 Crydom - Relays

CMRA4855 Description

CMRA4855 is a 480 V, 55 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 CMRA4855, and please confirm ratings against the datasheet before ordering.

Summary of Features

Target Applications

Crydom CMRA4855 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 CMRA4855 is a 55 A DIN-rail solid state relay with integral heat sink, CMR48 Series (45 mm wide, 48-530 VAC), SCR output, AC control (90-140 Vrms), zero voltage turn-on, LED input indicator. Source: Crydom CMR48 Series datasheet. Values at 25°C unless noted.

Parameter	Value
Output
Operating voltage (47-63 Hz)	48-530 Vrms
Maximum load current	55 Arms
Transient overvoltage	1200 Vpk
Minimum load current	0.25 Arms
Maximum surge current	954/1000 Apk (1 cycle, 50/60 Hz)
Maximum on-state voltage drop @ rated current	1.7 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	4555/4150 A²s (1/2 cycle, 50/60 Hz)
Switching type	zero voltage turn-on
Input
Control voltage range	90-140 Vrms
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)	16.8 oz (476 g)

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