WEG Electric UMBW Catalog

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UMBW

Thermal-Magnetic MCB

Overview:

Single pole and multi-pole thermal-magnetic miniature circuit
breakers (MCBs) in accordance with EN 60947-2, UL 1077 and
UL 489 for DIN rail mounting with toggle actuation, visual status
indication and high interrupt capacity. A positively trip-free snap
action mechanism ensures reliable switching behavior. A range
of trip characteristics and add-on accessories make the UMBW
suitable for a variety of applications.

Technical Data:

Current rating & rated voltage

IEC/EN 60947-2 1...63 A

1P (AC 230 V); 2P, 3P (AC 400 V)

UL 1077 1...63 A

1P (AC 277 V)
2P, 3P (AC 480Y/277 V)

UL 489

Trip Curves B, C, D (according to EN 60947-2)

1...63 A

1P (AC 120 V); 2P, 3P (AC 240 V)

1...20 A

1P (AC 277 V)
2P, 3P (AC 480Y/277 V)

1…63 A

1P (DC 60 V); 2P (DC 125 V)

Interrupting Capacity I

UL 1077 kA Ratings 1P 240VAC 7.5kA

UL 489 kA Ratings

Typically Life (electrically) 10,000 cycles

Typical Life (mechanically) 20,000 cycles

Protection Class IP 20

Ambient Temperature -35 °C ... +70 °C

Approvals IEC 60947-2, UL 1077, UL 489

Accessories

cu

1P 277VAC 5kA
2-3P 480VAC 5kA

240/277/480VAC 1-2-3P 10kA

Auxiliary Contact, Alarm Contact, Shunt
Release