B551-2 Crydom - Power Transistor Module

B551-2 Description

The B551-2 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.

Request a quote for the B551-2 and our team will get back to you with price, quantity available and lead time. We ship worldwide. As with any power device, please check the manufacturer's datasheet to confirm it matches your design.

Summary of Features

Target Applications

Crydom B551-2 is used for AC/DC power conversion and control: controlled rectifiers, DC motor drives, heater and power control, battery chargers and power supplies.

Key Specifications

Crydom B551-2 is a B-2 Series power module (B5, 25 A), circuit type 5, 120 VAC line, case with isolation barriers, for AC or DC variable voltage output. Source: Crydom B-2T, B-2 Series datasheet (Rev 121411). Values at 25°C unless noted.

Parameter	Value
Maximum DC output current (Tc = 85°C)	25 A
AC line input voltage	120 Vrms (400 VRRM)
Circuit type	5 (see datasheet schematic)
Maximum voltage drop (VF)	1.65 V @ 25 A
Maximum non-repetitive surge current (1/2 cycle, 60 Hz)	250 A
Maximum I²t for fusing (8.3 ms)	260 A²s
Critical rate of rise of on-state current (Tj = 125°C)	100 A/µs
Critical rate of rise of off-state voltage	500 V/µs
Gate trigger current / voltage (25°C)	60 mA / 2.5 V
Average gate power	0.5 W
Maximum peak reverse gate voltage	5.0 V
Maximum thermal resistance, junction to ceramic base per chip	0.9 °C/W
Operating junction temperature	-40 to 125°C
Isolation voltage	2500 Vrms
Weight (typical)	1.5 oz (42.5 g)

Technical document (PDF)  |  Request a quote for B551-2 (reply within 24 hours)