Overload protection in motor applications is typically handled using motor-protective circuit breakers with built-in short-circuit and overload protection, or by combining short-circuit protection devices with separate overload relays.

As technology evolves, the industry is moving away from traditional bi-metal solutions and adopting more advanced electronic options. Eaton’s ZEB electronic overload relay range is designed with this shift in mind, offering a compact and efficient solution that covers a wide range of motor protection needs.

With just seven models, the ZEB series caters to motor currents from 0.3 A up to 100 A. Unlike bi-metal relays, which generally offer a narrow setting range of 1:1.6, ZEB relays provide a much broader adjustment range of 1:5. This makes them a flexible choice for a wide variety of applications, including those with both symmetric and asymmetric loads.

The ZEB range is especially well-suited to industrial environments where reliability, adjustability, and space-saving are key.

Key Features

• Self-powered electronics – no external power supply required

• Broad setting range – 1:5 overload protection reduces the number of variants needed

• Adjustable tripping classes – select between 10A, 10, 20, or 30 to suit different start-up profiles

• Built-in earth fault detection – no need for additional components

• Customisable sensitivity – works with both balanced and unbalanced loads

• LED diagnostics – early warning of potential overloads

• Clear status indication – shows trip status at a glance

• Auto or manual reset – allows quick restart when needed

Whether you're looking to streamline your panel design, improve reliability, or cut down on wiring and accessory requirements, Eaton’s ZEB relays offer a modern and practical solution for motor protection.