MCCB 1250H Frame, 1000A-1250A Adjustable Thermal, 65kA - 3 Pole & 4 Pole | Onesto KCM5

The Onesto KCM5 1250H Frame MCCB is the largest adjustable thermal-magnetic moulded case circuit breaker in the KCM5 range, built for mixed load protection in large industrial electrical installations. It is suitable for electricians, panel builders, contractors and maintenance teams who need high-current protection that can be fine-tuned within its rated band on main incoming supply boards or large plant installations. Available in both 3 Pole and 4 Pole configurations, adjustable from 1000A to 1250A.

• Application: Suitable for main incoming supply boards and large industrial plant protection
• Key specification: 1000-1250A adjustable thermal band, 65kA Icu / 50kA Ics @ 400V, 690V rated operating voltage
• Pole configuration: Available in 3 Pole or 4 Pole
• Build quality: SABS approved to IEC 60947-2 / SANS 556-1, 1250H frame

Key Features

• Adjustable thermal trip (0.8-1 x In) lets you set the protection point within the 1000-1250A band
• Fixed magnetic trip above 10 x In for fast short-circuit clearance
• Moulded case construction for durability in panel and enclosure installations
• Rated for continuous operation at 690VAC, 50/60Hz
• Largest frame size in the KCM5 adjustable thermal MCCB range

Typical Applications

• Main incoming supply protection
• Large industrial plant and machinery protection
• Generator and genset protection circuits
• Large commercial and industrial building main protection

Technical Specifications

What's Included

• 1 x Onesto KCM5 1250H Frame Adjustable Thermal MCCB (as per selected pole configuration)

Please note: Enclosures, shunt release, auxiliary contacts, alarm contacts, under-voltage release, vari-depth handles and extension connectors are not included and are available separately.

Installation & Compatibility Notes

• Confirm the required number of poles before ordering.
• The thermal setting is adjustable only within the marked 1000-1250A band.
• Confirm the breaker will be installed in a suitable enclosure rated for the 1250H frame size.
• Installation must be carried out by a suitably qualified electrician in accordance with local electrical regulations.
• Confirm incoming supply fault-level requirements before specifying, given the high current involved.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.

Zisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.

Need help choosing? If you are unsure which pole configuration is correct for your installation, contact Zisabo with your application details and we will assist where possible.