Schneider Electric DPER12 Thermal Overload Relay - Compact Motor

In this review of the Schneider Electric DPER12 thermal overload relay, the bottom line is simple: it is a compact, reliable protector for small three-phase motors used in HVAC, compressors and pumps. Designed for installers and maintenance technicians who need a rugged, space-saving overload device with both manual and automatic reset options, this relay stands out for its clear trip indication, test and stop controls, and temperature compensation. The review finds it particularly useful when paired with Easy TeSys contactors or when DIN-rail mounting is required.

Key Features

• Thermal adjustment: The front thermal setting dial allows precise current range configuration so motors are protected at the correct 5.5-8A setting for the application.
• Phase and unbalance detection: Built-in phase-break protection and load unbalance detection reduce the risk of motor damage from single phasing or unequal loading.
• Reset and test controls: The manual/automatic reset selector, test selector and stop button let technicians safely simulate trips and control restart behavior on site.
• Durable connections: Screw clamp terminals provide secure wiring and reliable electrical contact in demanding industrial environments.
• Compact modular design: The small footprint and compatibility with Easy TeSys contactors and a mounting adaptor make it ideal where panel space is limited.
• Standards and protection: Rated for up to 690V IEC and cUL 600V with a lockable transparent cover for settings, offering industrial compliance and tamper protection.

Who It's For

This relay is aimed at electricians, HVAC service professionals and plant maintenance teams who need dependable overload protection for three-phase motors up to about 3kW at 400V. It is a good match for installations using Schneider Electric Easy TeSys contactors, small compressor drives, pumps, and lift or elevator auxiliary motors.

Those who require electronic motor protection with ground-fault sensing, wide electronic communication or integrated motor starters with advanced soft-start features should consider other product families; this unit focuses on straightforward thermal overload protection and mechanical compatibility with Easy TeSys contactors.

Pros & Cons

Pros

• Reliable thermal protection with temperature compensation for consistent tripping across varying ambient conditions.
• Clear trip indication, test button and reset selector improve on-site diagnostics and serviceability.
• Compact, modular form factor and DIN-rail or screw fixing allow flexible panel layouts and easy integration with contactors.
• Multi-standard certification (IEC, cUL) supports use in industrial settings.

Cons

• Limited to thermal-style overload protection; it does not provide advanced electronic protection features like communication or ground-fault sensing.
• Thermal range is fixed to the specified 5.5-8A setting for this unit, so other current ranges require a different model.

Specifications

Brand	Schneider Electric
Thermal setting range	5.5-8A
Rated insulation	600V cUL / 690V IEC
Tripping class	10
Motor protection capacity	3kW @ 400V (3-phase)
Terminals	Screw clamp terminals
Auxiliary contacts	1NO + 1NC for fault signalling

Our Verdict

The Schneider Electric DPER12 is a practical choice for technicians who need dependable, compact thermal protection for small three-phase motors. With clear controls, phase-break detection and modular mounting options, it provides solid value for HVAC, pump and compressor applications where straightforward overload protection and Easy TeSys compatibility matter most.

Frequently Asked Questions

Can this relay be used with Easy TeSys contactors?
Yes, the DPER series connects directly to the bottom terminals of compatible DPE contactors and is also compatible with the Easy TeSys GP2E manual motor starter series.

What protection features does it include?
It includes thermal overload protection with temperature compensation, phase-break and load unbalance detection, plus a trip indicator and auxiliary contacts for signalling.

How is it mounted and wired?
The unit mounts on DIN rail or by screw fixing and connects using screw clamp terminals; settings are protected by a lockable transparent cover.