Eaton 4 → 6.3 A Motor Protection Circuit Breaker, 690 V ac

Modular Motor Protective Circuit Breakers designed for use with add-on contactor modules and accessories which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up assembly work and minimise wiring errors.,Various enclosure options are available, see PKZM Enclosures range.

Rated operating voltage 690Vac
Operating temperature range -25°C to +55°C
Temperature compensated range -5°C to +40°C
Adjustable current trip level, 0.6 – 1.0 x nominal rating
Short-circuit trip level (fixed) 14x nominal rating
Single-phase-failure sensitivity to IEC60947-4-1
Dimensions 195 x 45 x 77 (HxWxD) mm
Rotary switch operation with padlockable handle option, see accessories
On/Off/Tripped indication may be locked in the "off" position with handle

MPCBs are more critical now than ever. Most infrastructures now rely on a motor behind the scenes to power critical uninterruptible systems such as heating, ventilation and cooling. These systems are vital in ensuring business continues as usual, therefore must be protected against overcurrent's, thermal overloads and similar problems.

IEC (EN60) 947-1 general, 947-2 Circuit breakers, 1-4 switch disconnectors, 1-5 Motor starters, 1-6 Electrical equipment of machines

UL, CSA, LROS, GL

Need a reliable solution to protect your motors from electrical faults? This robust motor-protection circuit breaker (MPCB) from Eaton will terminate power supplies in the event of voltage overloads, short circuits or relay shutdowns. As an intermediary between electrical circuits and applications, it prevents damage to devices and equipment. It's suitable for motors in fans, pumps and compressors. Use this unit to reduce the downtime of instruments and prevent interruptions to workflows. By reducing the chance of electrical fire, it also contributes to workplace safety.

• Short circuit breaking capacity ensures the unit trips the power before damage is caused to equipment
• Accessories like auxiliary contacts and shunt trips can be fitted without using additional tools
• IP20 (ingress protection) rating indicates this MPCB is touch-proof and protected from items over 12mm

Excess current causes a bimetallic strip in the MPCB to trip. This releases a switch, which moves the electrical contact points apart to confine the arc. The arc is divided and cooled by an insulated metal strip. The contacts close again once the fault has been fixed.