Eaton Moeller
ZEV Electronic Motor Protective Relay

Moeller’s ZEV electronic overload relay offers the ultimate motor protection at an economical price. The base unit protects against overloads, phase failure and phase imbalance in motors from 1 to 820A. Thermistor connections and optional ground-fault protection make the ZEV a great choice for virtually all applications where sophisticated, yet economical motor protection is required.

The new standard in protection
Newly-developed sensor systems and tripping units make the ZEV electronic overload
relay the “top-of-the-range” in motor protection. Enhanced tripping classes provide reliable protection for motors with run-up times as long as 40 seconds. Trip classes are selectable from 5 to 40 seconds, allowing precise protection for a range of applications.

Additional features and options
Optional core-balance transformers detect ground faults quickly, while an integrated
thermistor connection makes it easy to upgrade to a full motor-protection
system.

Easy to operate
A built-in LCD guides you through set-up and operation. In the event of a fault, the display indicates the origin – speeding the process of troubleshooting and repair. Configurable auxiliary contacts may be added for communication of ground faults, thermistor trips, internal faults or early warning of an overload.

Flexibility for multiple environments
The multi-voltage module automatically adapts to different voltages from 24-240V AC/ DC, providing a fast and flexible connection to all conventional control.

Compact design
Ring-type current sensors make the ZEV a great choice for protection of even small motors. There’s no need for main current wiring or back pan drilling. The sensor is
installed quickly and easily with hook & loop fasteners. Compared to conventional transformers, this design is up to 58 times smaller, saving valuable space in the control panel.

Safety and approvals
The ZEV electronic overload relay is touch safe to IP20 specifications. It meets approval
standards of UL, CSA, IEC/EN 60 947 and VDE 0660.

A complete ZEV Electronic Motor Protective Relay consists of:

• One ZEV base unit

• One Current Sensor

• One Connecting Cable

• 
  For optional ground leakage protection select one Core Balance Transformer

ZEV Electronic Motor-Protective Relay
	Adjustable Setting Range	Length mm	Diameter mm	For use with..	Part Number
	1 – 820	--	--	DILEM DILM7 – DILM820	ZEV
Current Sensors
	1 – 25	--	6	DILEM; DILM7 – DILM25	ZEV-XSW-25
	3 – 65	--	13	DILM32 – DILM50	ZEV-XSW-65
	10 – 145	--	21	DILM65 – DILM115	ZEV-XSW-145
	40 – 820	--	110	DILM185 – DILM820	ZEV-XSW-820
Connecting Cables
	--	200	--	ZEV-XSW-25 ZEV-XSW-65 ZEV-XSW-145 ZEV-XSW-820	ZEV-XVK-20
	--	400	--		ZEV-XVK-40
	--	800	--		ZEV-XVK-80
SSW Core-Balance Transformers (for ground-leakage monitoring)
	--	--	40	--	SSW40-0.3
	--	--		--	SSW40-0.5
	--	--		--	SSW40-1
	--	--	65	--	SSW65-0.5
	--	--		--	SSW65-1
	--	--	120	--	SSW65-120-0.5
	--	--		--	SSW65-120-1
Mounting Adapter
	Enables screw mounting of ZEV and Current Sensors to back pan			ZEV ZEV-XSW-25 ZEV-XSW-65 ZEV-XSW-145	ZB4-101-GF1

The switchgear is designed for “CLASS 10” in normal and overload operation. To ensure that the switchgear (circuit-breaker and contactor) as well as the cables are not overloaded with extended tripping times, they must be over-dimensioned accordingly. The rated operational current Ie for switchgear and cables can be calculated with the following current factor while taking the tripping class into account:

With the ZEV-XSW-25 to ZEV-XSW-145 push-through sensors, the motor supply leads for each phase are pushed through the respective push-through openings. On motor currents which are less than 1 A, the motor supply leads with the ZEV-XSW-25 are inserted in loops. The number of loops depends on the rated motor current involved.
 

The current setting IE of the device is calculated as: IE = n x IN