MCCB Under Voltage Release | Onesto KCM5

The Onesto KCM5 Under Voltage Release is a protection accessory that fits onto a KCM5 MCCB and automatically trips the breaker open if supply voltage drops or is lost, and prevents re-closing until voltage is restored. It is suitable for electricians, panel builders and control system integrators who need automatic disconnection on loss of supply, commonly used for safety interlocking and process protection. Available sized to match the 160S, 250S, 400S, 630S, 800S, 1000S or 1250S KCM5 MCCB frame, in 220VAC or 380VAC coil voltage, fitted to the right-hand mounting position.

• Application: Automatic breaker tripping on loss of supply voltage, safety interlocking
• Key specification: Available in 220VAC or 380VAC coil voltage
• Compatibility: Select the size matching your installed KCM5 MCCB frame
• Mounting position: Right-hand mounting

Key Features

• Trips the breaker automatically if supply voltage falls below a safe threshold or is lost
• Prevents re-closing of the breaker until voltage is restored, supporting safety interlock requirements
• Fits directly onto the matching Onesto KCM5 MCCB frame without modification

Typical Applications

• Safety interlocking on machinery and process equipment
• Automatic disconnection on loss of mains supply
• Generator and changeover panel protection
• Industrial control panels requiring under-voltage protection

Technical Specifications

What's Included

• 1 x Under Voltage Release module (sized and voltage as selected)

Please note: The MCCB itself is not included and must be purchased separately.

Installation & Compatibility Notes

• Confirm the frame size of your installed MCCB and the correct coil voltage before ordering.
• This accessory fits the right-hand mounting position — confirm this position is free on your breaker.
• Installation, including any safety interlock wiring, must be carried out by a suitably qualified electrician in accordance with local electrical regulations.

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 frame size or coil voltage is correct for your MCCB, contact Zisabo with your breaker model details and control voltage and we will assist where possible.