Circuit Protection

ISOMAX S1 MCCB 125A Thermal Magnetic Circuit Breaker

Walax ISOMAX-equivalent S1 molded case circuit breaker rated 125A with fixed thermal-magnetic protection. A compact, cost-effective feeder breaker for commercial distribution boards and motor circuits.

125A Feeder Rating

The standard rating for commercial sub-mains and motor feeders.

Compact S1 Frame

Space-efficient body for dense distribution boards.

Fixed Thermal-Magnetic

Simple, reliable protection with no settings to misadjust.

Specifications

Technical Specifications

Standard ratings listed below – custom configurations available on request. Contact our engineers to confirm parameters for your market.

StandardIEC 60947-2 · CE
Rated current (In)125A
Poles3P / 4P
Rated voltageAC 400V (50/60Hz)
Breaking capacity25kA
Trip typeThermal-magnetic (fixed)
FrameISOMAX S1 (compact)
MountingFixed / DIN rail
Mechanical life≥ 10,000 operations
Ambient temperature-5°C to +40°C
Applications

Where These Breakers Ship

Commercial distribution boards, sub-main feeders and motor control circuits up to 125A. The compact frame suits installations where board space is limited.

FAQ

Frequently Asked Questions

Yes – the S1 frame matches the ISOMAX footprint for drop-in replacement in existing boards.
Yes – this S1 model uses fixed thermal-magnetic protection for simplicity and reliability.
Yes – see our ISOMAX S2 and DIN-rail adjustable MCCBs for adjustable trip settings.
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