TELE HAASE PW 400V O4X with TR3

Tele Haase 3-Phase Monitoring Relay

Description

The Tele Haase PW 400V O4X is a robust phase monitoring relay designed for the protection of three-phase electrical systems. It provides reliable monitoring for phase failure, phase sequence, voltage asymmetry, and over/undervoltage conditions. This unit is part of the proven GAMMA series and is ideal for protecting motors, pumps, and other critical equipment from damaging power quality issues. It includes the TR3 plug-in module, which allows the relay to be powered by a standard 230V AC control voltage. Its DIN rail mountable design ensures easy integration into new or existing control cabinets. Order now from spareparts2day for expert support and fast delivery.

Specifications

• Manufacturer: Tele Haase
• Model: PW 400V O4X
• Included Module: TR3 Power Supply Module
• Function: 3-Phase Monitoring (Phase failure, sequence, asymmetry, over/undervoltage)
• Nominal Monitored Voltage: 400V AC
• Control Supply Voltage: 230V AC, 50/60 Hz (via TR3)
• Output Contact Rating: 5A at 250V AC
• Mounting: DIN Rail

Application

This relay is essential for applications requiring protection of three-phase motors, such as in conveyor systems, HVAC units, pumps, and industrial machinery, preventing damage from unstable power supplies.

Country of Origin

Made in Austria.

CO2 Impact

Choosing this pre-owned relay over a new one prevents the emission of approximately 6.0 kg of CO2, contributing to a more sustainable industrial environment.

Availability

This item is in stock and ready for immediate dispatch.

FAQ

Question?

What is the function of the TR3 module included with this relay?

The TR3 is a plug-in power supply transformer module. It adapts the relay’s internal electronics to a control voltage of 230V AC, allowing it to be used in standard control cabinets even though it monitors a 400V three-phase system.

Question?

How do I adjust the voltage monitoring window and asymmetry settings?

The settings are adjusted using the four potentiometers on the top face of the unit. ‘ASYM’ sets the asymmetry trip level. ‘SYM min’ sets the undervoltage threshold, and ‘SYM max’ sets the overvoltage threshold. The fourth potentiometer adjusts the trip delay.

Question?

Is this relay suitable for monitoring phase sequence?

Yes, based on the function of the Tele Haase PW series relays, it monitors for phase failure, incorrect phase sequence, asymmetry, undervoltage, and overvoltage, providing comprehensive protection for your equipment.

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Last Update: Friday, March 13, 2026