EATON MOELLER ZM-25-PKZ2 283133

Eaton Moeller Motor Protection Trip Block 16-25A ZM-25-PKZ2

Description

The ZM-25-PKZ2 is a high-quality motor-protective circuit-breaker trip block from the Moeller series by Eaton. This unit is designed to be used with the PKZ2 motor protection system, providing essential overload and short-circuit protection. It features a convenient dial for adjusting the thermal trip current between 16 and 25 Amperes, ensuring precise protection tailored to your motor’s specifications.

Specifications

• Manufacturer: Eaton Moeller
• Type: ZM-25-PKZ2
• Part Number: 283133
• Function: Thermal-Magnetic Trip Block
• Current Setting Range: 16 – 25 A
• Rated Voltage: Up to 690V AC
• Compatibility: For use with PKZ2 series base units
• Number of Poles: 3

Label Info

• Standards: IEC/EN 60947, UL Listed (340B), CSA Certified (44120)
• Max HP Ratings (3PH): 7.5 HP at 200/230V, 20 HP at 460V, 25 HP at 575V

Application

This trip block is an integral component for motor control centers and standalone motor applications in various industries, including manufacturing, automation, and processing. It is specifically designed as a component for the now obsolete but widely installed PKZ2 system, making it a critical spare part for maintaining existing infrastructure.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned ZM-25-PKZ2, you are contributing to a circular economy and have helped avoid the emission of approximately 20.0 kg of CO2, which would have been generated in the production of a new unit.

Availability

This is an obsolete item but available from our stock. Limited quantities available. Order now from spareparts2day for expert support and fast delivery.

FAQ

Can this ZM-25-PKZ2 trip block be used with a PKZM0 base unit?

No, the ZM-25-PKZ2 trip block is specifically designed for the older Moeller PKZ2 series. It is not mechanically or electrically compatible with the modern Eaton PKZM0 series of motor protective circuit breakers. Using them together is not possible and would be unsafe.

How do I correctly set the overload protection current on the dial?

The dial should be set to the motor’s full-load ampere (FLA) rating, which can be found on the motor’s nameplate. The trip block is designed to trip at 125% of the dial setting during an overload condition, providing standard motor protection. Do not set it higher than the FLA to avoid motor damage.

What does the “Test” button do, and how often should it be used?

The “Test” button provides a mechanical test of the tripping mechanism to ensure it functions correctly. It does not test the thermal or magnetic elements. It is good practice to test the mechanism during commissioning and periodically during maintenance checks, for example, annually, to verify the mechanical linkage is free and operational.

Last Update: March 13, 2026

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