WTAIELE

Moulded Case Circuit breaker

MCCB solutions for higher-current circuits, offering adjustable protection and durable panel-ready design.

Moulded Case Circuit breaker products

WTCM1-250 Moulded Case Circuit Breaker

WTCM1-250 Moulded Case Circuit Breaker

High Current Rating: Rated current from 100A to 250A on the WTM1-250, with the WTM1 series spanning 16A to 1250A for DC distribution. DC Voltage Coverage: DC operating voltage of 550V in 2P, 750V in 3P and up to 1500V

Feeder Breaker for an AC or DC Board?

Send the system voltage, continuous current and fault level. We reply within 24 hours with the frame, pole arrangement and isolation rating.

MOULDED CASE BREAKERS

MCCB Frames for AC and DC Feeders up to 250 A

An MCCB sits between a miniature breaker and an air circuit breaker. It handles feeder and mains currents, has a moulded case that contains the arc, and usually adds an isolation function so it can double as the disconnector for a board.
The WTCM1-250 covers AC distribution on a 250 A frame. The WTM1-250 is the DC version for 1500 V systems in two-pole and four-pole formats, used on battery storage and large solar arrays where a miniature breaker no longer has the breaking capacity.
MCCBs are chosen by three numbers: rated current, breaking capacity at the installation voltage, and the trip setting. Units carry CE and CCC marking.
MCCB Frames for AC and DC Feeders up to 250 A

MCCB Selection

Start with the frame, then the trip unit, then the breaking capacity at the actual system voltage. A frame rated for 400 V AC is not automatically suitable for 1500 V DC.
Model System Frame Poles Use
WTCM1-250 AC 250 A 3P AC feeders, mains
WTM1-250 2P DC 1500 V 250 A 2P DC feeders
WTM1-250 4P DC 1500 V 250 A 4P DC main switching

What to send

  • System voltage and type, AC or DC. The DC breaking capacity depends on the number of poles in series.
  • Continuous current and the cable size, so the trip setting can be matched.
  • Prospective fault current at the point of installation, so the breaking capacity is not exceeded.
Send those three numbers and we will confirm the frame and the pole arrangement within 24 hours.
FEEDER PROTECTION

Frame, Trip Unit and Breaking Capacity Are Three Different Things

The Frame Is Not the Rating

A 250 A case can hold a lower trip unit. The panel schedule has to state the rating, not the frame.

DC Needs Its Own Frame

A 400 V AC rating says nothing about a 1500 V DC feeder, where the arc behaves differently.

Isolation Is a Rating, Not a Label

The frame can double as a disconnector, but only at the isolation rating stated for it.
COMMON QUESTIONS

Frequently Asked Questions

An MCB is a miniature breaker for final circuits, normally up to 125 A. An MCCB uses a moulded case for higher currents, typically from 100 A upward, and usually adds an isolation function and a wider range of trip settings.

CONTACT US

Start Your Electrical Project Today

Send your application, voltage, certifications and quantity to this electrical protection manufacturer. We reply with a quotation within 24 hours.
  • Engineering review by an electrical protection manufacturer before quoting
  • Plant pricing with no intermediaries
  • Export packing and shipping handled in one place
  • One order owner from quotation to delivery