X10759 HVAC | HEATER BATTERY CONTROLLER

PR3-E SERIES

150kW (210A), 180kW (250A), 415V

Three Phase Burst Fire Power Controller

BMF House - Wight Moss Way,

Southport Business Park

Southport PR8 4HQ

ENGLAND, UNITED KINGDOM

Contact Us:

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0044 (0) 1704-516 501

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enquiries@united-automation.com

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www.united-automation.com

unitedautomationltd

UA_Limited

1 July 2025 | Issue: 6

Page

2 of 4

INSTALLATION

Cooling Requirements

This robust stack assembly has an operational temperature of 65°C when naturally cooled

and has a built in 90°C over temperature trip on the heatsink as a safety feature. The unit

should be mounted vertically, with heatsink fins top to bottom, and with sufficient surrounding

air space to maximise natural convection cooling. If the unit is mounted in an enclosure or

cabinet, adequate ventilation and/or forced air-cooling should be fitted. This PR3-E – range

have forced air cooling fans fitted, which are designed to be permanently “on” when in use.

Load considerations

The PR3 series of power controllers are designed for 3-wire, 3-phase floating-star or closed

delta configured resistive loads. The PR3 series are 2-leg thyristor controllers and therefore

unsuitable for 4-wire, 3-phase with star point to neutral configured loads. For further

information on configured loads, see the ‘Application circuits’ section of our supporting

datasheet – APC (ref. X10322).

Unusual heating loads such as Molybdenum, Platinum or Tungsten have a typical 10:1 hot-

to-cold resistance ratio and therefore, when cold, draw larger currents than normal.

Connections

This unit has Power terminals and simple clamp type terminal connectors for all auxiliary

wiring requirements (see SPECIFICATIONS below).

NOTE: It is factory set for an internal power supply. For alternative ‘voltage free’ alarm supply

details see Functions section. Please contact our Technical support for further details.

SAFETY WARNING – Isolate supply before removing cover; Metal parts, in particular the

heatsink, may get very hot when the unit is fully operational;

DO NOT COVER enclosure

ventilation slots.