Description
ABB S203-B25 3-POLE MINIATURE CIRCUIT BREAKER 2CDS253001R0255
ABB STOTZ-KONTAKT GMBH
S203-B25
3-POLE MINIATURE CIRCUIT BREAKER
GB10963
2CDS253001R0255
UMAX: 253/440 VAC
277/480 VA.C. 110VD.C
IEC 60947-2
MADE IN GERMANY
REF.NO: FKM10575
The ABB S203-B25 is a 3-pole miniature circuit breaker (MCB) with a B-curve 25A rating, designed for reliable overcurrent and short-circuit protection in low-voltage distribution systems. Onboard vessels, MCBs of this type are critical components within main and auxiliary switchboards, motor control centres, lighting panels, and essential service distribution boards. The B-type tripping characteristic makes it well suited for resistive loads and circuits where rapid disconnection at moderate overcurrents is required, helping to protect sensitive equipment and maintain electrical safety at sea.
Key Features
✓ 3-pole configuration for balanced three-phase circuit protection in marine electrical systems
✓ B-curve tripping characteristic — suitable for resistive and lightly inductive loads
✓ Rated for UMAX 253/440 VAC and 110 VDC, supporting a range of onboard voltage configurations
✓ Compliant with IEC 60947-2, a widely recognised standard for low-voltage switchgear
✓ Manufactured in Germany by ABB Stotz-Kontakt GmbH — a globally trusted name in marine-grade electrical protection
Marine Applications
Protection of branch circuits within main and emergency switchboards on commercial vessels
Overcurrent protection for auxiliary machinery control panels and motor starters
Safeguarding lighting and socket distribution boards in accommodation and engine room spaces
Circuit protection in HVAC, galley, and navigation equipment power distribution systems
Use in shore power connection panels and portable generator distribution assemblies
Why Marine Engineers Choose
ABB S203 series MCBs are widely installed across global fleets due to their proven reliability, compact DIN-rail mounting design, and compliance with international standards. Marine engineers trust ABB circuit breakers for consistent performance in the demanding conditions found onboard — including vibration, humidity, and fluctuating loads — ensuring vessel electrical safety and classification compliance.
Ideal For
Bulk carriers, container ships, tankers, offshore support vessels, passenger ships, ferries, naval vessels, mega-yachts, tugs, and floating production units — any vessel or offshore installation utilising ABB low-voltage distribution equipment.
Technical Support & Compliance
We provide complete support solutions including remote troubleshooting, onboard technical assistance, testing and commissioning, repair services, retrofit and upgrade programmes, and full integration support for ABB low-voltage switchgear components. To confirm compatibility with your specific installation, please share nameplate photographs, existing part numbers, electrical drawings, switchboard model and version details, vessel name and IMO number, and project scope. All technical matches are subject to confirmation based on the information provided.
