Description
- Model: ZM-40-PKZ2
- Brand: ABB / Eaton-Moeller legacy product family
- Part Type: Motor protection trip module
- System Compatibility: PKZ2 motor protection system
- Rated Uninterrupted Current: 40 A
- Lifecycle: Discontinued product; the PKZ2 system was discontinued in 2012 according to the OEM datasheet.
Technical Introduction
The ABB ZM-40-PKZ2 is a trip block for the PKZ2 motor protection system, providing adjustable thermal overload and magnetic short-circuit protection.
This is not a standalone motor starter. The module is installed with the appropriate PKZ2 base device to form the complete motor protection assembly. The documented ZM-40- has a 40 A rated uninterrupted current, with an adjustable thermal overload range of 32–40 A and an adjustable magnetic short-circuit range of 350–500 A. OEM documentation also specifies phase-failure sensitivity in accordance with IEC/EN 60947-4-1.
Best Suited For
- legacy motor-control panels
- Replacement of failed or aged ZM-40- trip modules
- MRO inventory for discontinued motor protection equipment
Core Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer / Brand | ABB / Eaton-Moeller legacy product family |
| Model | ZM-40- |
| Article Number | 050336 |
| Product Type | trip block / motor protection module |
| Rated Uninterrupted Current | 40 A |
| Thermal Overload Setting | 32–40 A |
| Magnetic Short-Circuit Setting | 350–500 A |
| Thermal Setting Principle | 0.6–1.0 × Iu |
| Magnetic Setting Principle | 8.5–14 × Iu |
| Maximum Motor Rating | Up to 30 kW at 660–690 V, depending on application |
| Protection | Overload and short-circuit |
| Phase-Failure Sensitivity | IEC/EN 60947-4-1 |
| Applicable System | |
| Product Status | Discontinued |
ABB ZM-40-PKZ2
The OEM documentation identifies article number 050336 and states that the system was discontinued in 2012. The documented product standards include UL 508, CSA-C22.2 No. 14, IEC 60947-4-1, and CE marking.
Field Engineer’s Tech Notes
- Set the overload dial from the actual motor FLC. Do not simply leave the 32–40 A range at its maximum setting. The OEM documentation specifies adjustment according to the motor’s rated operating current and service factor.
- Confirm the complete assembly before ordering. ZM-40- is the trip module only; a compatible base device is required for a complete starter/protection assembly.
Adaptive QA & Testing Protocol
For a motor-protection trip module, incoming inspection focuses on the trip mechanism, adjustment dials, mounting interface, terminals, markings, and physical condition. The thermal and magnetic adjustment ranges are checked against the specified 32–40 A / 350–500 A ranges where suitable test equipment is available.
For replacement-stock units, we also verify the article number and inspect the mechanical interface before shipment. Inspection photographs, test documentation, or available test videos can be provided upon request.
ABB ZM-40-PKZ2
Buyer’s FAQ
Q: Is ZM-40- still an active ABB product?
A: No. OEM documentation identifies the system as discontinued in 2012. This makes verified surplus and professionally inspected refurbished stock relevant for legacy installations.
Q: What is the adjustment range?
A: The thermal overload setting is 32–40 A, while the magnetic short-circuit setting is 350–500 A.
Q: Is ZM-40- the complete motor starter?
A: No. It is the trip module. A compatible base device is required to build the complete motor protection assembly.
Q: What should I provide when requesting a replacement?
A: Provide the existing module’s complete marking, article number if visible, the base model, motor nameplate current, and the existing panel configuration. This allows the replacement to be checked against the installed protection scheme.
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