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June 2015 - CARLO GAVAZZI has launched a new range of Miniature Circuit Breakers for up to 480Y/277VAC systems: GMB Series UL489 MCBs for Branch Circuit Protection and GSB Series UL1077 MCBs for Supplementary Circuit Protection.

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The GMB Series are UL489, AC miniature molded circuit breakers, which provide reliable protection for a wide range of applications including branch circuit protection of HACR equipment, power supplies, transformers, motors, receptacles and other equipment. 1, 2 and 3 pole arrangements are available, ranging from 0.5A to 63A, with short circuit interrupt capacity of 10kA. The GMB Series circuit breakers are cUL listed and conform to IEC standard EN-60947-2.

The GSB Series are UL1077 AC supplementary circuit protectors, which offer overcurrent protection for specific applications where branch circuit protection is already provided by another device or is not required. They are available in 1, 2, 3 and 4-pole variations, ranging from 1 to 63Amps and have a short circuit interrupt capacity of 5kA. The GSB Series are cUL recognized components.

The new GMB Series UL489 branch circuit protectors and GSB Series UL1077 supplementary protectors are housed in compact 17.5mm wide housings (per pole), with robust DIN-rail mounting and red/green diagnostic trip indicators. C tripping curve is standard, with B & D tripping curves available upon request.

Technical specifications include:

GMB Series UL489 Branch Circuit Protectors
1, 2 and 3 Pole from 0.5 to 63Amp
480Y / 277VAC maximum voltage rating
10kA short circuit rating
cULus Listed
GSB Series UL1077 Supplementary Circuit Protectors
1, 2, 3 and 4 Pole from 1 to 63Amp
480Y / 277VAC maximum voltage rating
5kA short circuit rating
cRUus recognized

The new GMB and GSB Series are available from CARLO GAVAZZI’s North American network of sales offices and distributors, or at

For more information on the GMB and GSB Series, please click on any of the links below:

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Mexico 52.55.5373.7042

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