Abb ST202M-B25 Miniature Circuit Breaker 2P 25A B-curve

Product Description

The ABB ST202M-B25 is a 2-pole miniature circuit breaker (MCB) rated at 25 amps with a B-curve trip characteristic and a 10 kA interrupting capacity. It is designed to provide overcurrent and short-circuit protection in supplementary protection applications and is listed under UL 1077. Licensed electricians and panel builders install this device in load centers, control panels, and distribution boards where reliable branch-circuit or equipment protection is required. The B-curve trip characteristic makes it well suited for resistive and light inductive loads.

The ST202M-B25 is intended for supplementary protective applications in residential and light commercial electrical systems. It fits into DIN-rail-mounted enclosures and control panel assemblies where a compact, dual-pole breaker is needed. Its 25-amp rating and B-curve response are appropriate for circuits serving resistive heating elements, lighting loads, and similar equipment with low inrush current demands. UL 1077 listing confirms suitability for use in North American supplementary protection applications.

Key Features

• B-curve trip characteristic for resistive and low-inrush load protection
• 25-amp continuous current rating
• 2-pole configuration for simultaneous disconnection of both conductors
• 10 kA interrupting capacity for reliable short-circuit protection
• UL 1077 listed for supplementary overcurrent protection
• DIN-rail mount design for compact panel installation

Compatibility

Designed as an OEM-style supplementary circuit breaker for DIN-rail-mounted control panels and distribution enclosures requiring a 2-pole, 25-amp, B-curve MCB with UL 1077 listing.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the panel or enclosure before installing or replacing the breaker. Verify that conductor sizing and terminal torque requirements match the panel assembly documentation. UL 1077 listed breakers are rated for supplementary protection and are not intended as branch-circuit protection replacements without engineering review.

Technical Specifications

• Poles: 2
• Amperage Rating: 25 amps
• Trip Curve: B-curve
• Interrupting Capacity: 10 kA
• Listing: UL 1077

Standard Information

• Brand: ABB
• Manufacturer Part Number: ST202M-B25