MoellerZ00-0,43-Pole Thermal Overload Relay, 0.24-0.40 A Adjustable, 600 V AC, Class 10, for DIL00M / DIL0M Contactors

Product Description

What this part is

A Moeller Z00 series thermal overload relay — a three-pole bimetal overload element with an adjustable current dial, a hand/auto reset selector, a reset button and a test/OFF button. It is not a breaker: it provides motor overload protection only and relies on an upstream fuse or circuit breaker for short-circuit protection. This is the 0.24 to 0.40 A band.

Decoding the designation

Z – Moeller thermal overload relay00 – sized for contactor frame 00; the Z00 fits contactor sizes 00M, 00AM, 0M and 0AM0,4 – top of the setting range in amps, European decimal comma; written Z00-0.4 in North America

What these specs mean in practice

The dial is set to the motor full-load current, and the relay trips at 125% of the dial setting. For motors with a service factor of 1.0, Moeller’s own instruction is to set the dial to 90% of full-load current rather than to nameplate. Single-phasing sensitivity means the relay reacts to a lost phase, not just to a symmetrical overload — the failure mode that actually burns out small three-phase motors. The relay is supplied with the reset lever set to Hand, which is what you want on two-wire control so a cooled bimetal cannot restart the motor on its own; switch it to Auto only with three-wire control. Short-circuit protection has to come from elsewhere: maximum 15 A fuse or 25 A circuit breaker at 600 V AC for this rating.

Published specifications

Poles: three, bimetal thermalSetting range: 0.24 to 0.40 A, adjustable dialTrip point: 125% of dial setting; tripping class 10Single-phasing (phase-failure) sensitiveRated main-circuit voltage: 600 V ACMaximum short-circuit protection: 15 A fuse, or 25 A circuit breaker, at 600 V ACAuxiliary contacts: 1 normally open + 1 normally closedReset: hand/auto selector lever, supplied set to Hand; internal reset button; trip-free if the button is heldTest/OFF button for simulated trip and for de-energising self-maintaining contactorsTemperature compensated, continuousAmbient temperature: +50 / −25 °C open, +40 / −25 °C enclosedMechanical shock resistance: 10 g, sinusoidal 10 msDegree of protection: IP20; finger and back-of-hand proofMain terminal capacity: 18 to 14 AWG solid or strandedHeat loss in current paths: 2.5 W minimum setting, 6 W maximum setting (Z00 series)Dimensions with EZ00 base: 45 mm wide x 85 mm high x 73 mm deepSide-by-side mounting: leave at least 5 mm between relaysStandards: UL, CSA, IEC/EN 60947, CE, DIN VDE 0660; UL file E29184, CSA files 45958 and 43359Climatic: damp heat constant per IEC/EN 60068-2-3, cyclic per IEC/EN 60068-2-30

Quantity and configuration

Sold as 1 piece — the relay only. Nothing else is in the box: the contactor, the EZ00 base needed for separate (stand-alone) mounting, the MDE-287 external reset button used with enclosed relays and any PDT-A2 cover kits are all separate items.

Installation and setup notes

For direct mounting the relay clips onto the load side of a matching DIL00M, DIL00AM, DIL0M or DIL0AM contactor and picks up its power connections there; for stand-alone mounting you need the EZ00 base. Always wire all three poles even in single-phase applications. Allow 5 mm clearance between adjacent relays or their thermal calibration interferes. On an enclosed assembly, remember the ambient limit drops to 40 °C, and fit the MDE external reset button so a trip can be cleared without opening the door.

Interchange guidance

Z00 and ZE are the two relays that get swapped by mistake. The ZE covers the same 0.24 to 0.40 A band as ZE-0.4 but mounts on a contactor only — there is no separate-mounting base for it — and its circuit-breaker short-circuit protection is limited to 480 V AC rather than 600 V. Within the Z00 range the setting band is the part: Z00-0.24 and Z00-0.6 are the neighbours and neither protects a 0.32 A motor properly. Z1, Z4, Z5 and ZW7 are larger frames for larger contactors. Eaton’s modern equivalent line is the ZB/ZE series; check the contactor frame before assuming a fit.