Javascript is not enabled on your browser.
Javascript is required for many of our site's features to work properly. Please enable javascript in your browser preferences to continue.

NEW! Need to cancel an order or line items (if not yet processed)? Login, go to My Orders, choose "Request Cancellation" & follow prompts.

Quick links available. Login, then orders, product returns, invoice reprint, packing list reprint. More through the "Accounts & Orders" menu.

Shopping Categories

Learn More

In Depth Product Sites

Product Selectors &
Configuration Utilities

Circuit Protection /... > UL 489 Miniature Cir... > Gladiator Miniature Circuit Breakers (GMCBU Series)

UL 489 Miniature Circuit Breakers

Gladiator UL 489 miniature circuit breakers protect feeder, branch and control circuits from overload current. Dual rated for AC or DC applications, space-saving DIN-rail mountable 1-, 2-, and 3-pole breakers offer B, C or D overcurrent trip curves, and are available in current ratings up to 63A.

1-Pole (1A-63A)

2-Pole (1A-63A)

3-Pole (1A-63A)

Shop Now

Gladiator Miniature Circuit Breakers (GMCBU Series)

Gladiator GMCBU Series

Single-Pole (1A-63A) Mini Circuit Breakers
Two-Pole (1A-63A) Mini Circuit Breakers
Three-Pole (1A-63A) Mini Circuit Breakers

Gladiator miniature circuit breakers offer optimum and efficient protection for branch and control circuits up to 63 amps. The Gladiator series is available with B, C or D trip characteristics in accordance with UL 489. The Gladiator series units are DIN rail mountable and can be used in feeder and branch circuit applications.

Applications

Feeder and Branch Circuit Protection

PLC I/O points
Motor control circuits
Control instrumentation
Power supplies
Relays
Convenience receptacle circuits (internal / external)
Load circuits leaving the equipment (external)
Computers
UPS
HACR Equipment (Heating Air Conditioning, Refrigeration)
Power conditioners

Gladiator mini circuit breakers start at
$13.00
(GMCBU-1B-1)

Gladiator Mini Circuit Breakers Overview

Features

Dual rated for AC or DC applications
Complete range of UL 489 listed DIN rail mounted miniature circuit breakers up to 63 amp current rating
Single-pole, two-pole and three-pole models
Suitable for reverse feed applications
Suitable for branch circuit device protection
Trip-free design - breaker cannot be defeated by holding the handle in the "ON" position
Captive screws cannot be lost
Can also be used in applications for which UL 1077 or CSA C22.2 No.235 are also allowed
Field installable shunt trip and auxiliary switches, side mountable
Module width of only 18mm [0.71 in] (per pole)
Contact position indicator (red / green)
35mm DIN rail mountable, utilizing spring clip

Thermal magnetic overcurrent protection:

Three levels of short circuit protection, categorized by B, C and D curves
B-curve magnetic trip point: 3 to 5 times the rated current, typically used for esistive loads such as conductors or heaters.
C-curve magnetic trip point: 5 to 10 times the rated current, typically used for small transformers, pilot devices, etc.
D-curve magnetic trip point: 10 to 20 times the rated current, typically used for transformers or very high inductive loads.