• Model:RTRDU4.0

RTRDU 3 Phase Trickle & Boost 5 Step Speed Controller - 4 Amps

£ 799.99 (excl. VAT)

£ 959.99 (inc. VAT)


A three-phase transformer which controls the fan speed by altering the supply voltage in five fixed steps. The steps are adjusted manually, using the control knobs on the front of the unit.

There are two control knobs: one for higher fan speeds and one for lower fan speeds. Switching between the high and low settings is done by an external change-over contact, which could be a thermostat or a timer.

An integral motor protection device is included which cuts the supply voltage to the fan if the thermal contact in the fan motor is activated. The unit is reset by turning the switch to 0 for 10 seconds, after which the unit restarts.

Input terminals for room thermostat RT cuts supply voltage to the fan when the circuit is broken. Terminals are linked before delivery. The indicator lamp on the front shows when the transformer is in operation.

The transformer has 230V terminals for operating dampers, electric heater batteries or other external equipment. These terminals have no current when the transformer switch is in position 0, or when the TK or RT input is open. Supply voltage: 400V 50/60Hz.
PDF Files


Data sheet

1 x Elta 2 Amp Electronic single phase speed controller.1 x Balance S Diffuser - NO RING - 125mm1 x NKS-D swirl diffuser v-300 x 300mm2 x Remote controller FLEX - for VEKO INT1 x Elta 3 Amp Electronic single phase speed controller with TK1 x Airvent ceiling fan controller1 x ELTA - Single Phase Transformer 8amps1 x Circular Ceiling Diffuser - TST 1251 x ELTA - Single Phase Transformer 16amps1 x ELTA - Single Phase Transformer 12amps1 x PCA Diffuser - PCA-3153 x Elta 6 Amp Electronic single phase speed controller with TK3 x Elta 3 Amp Electronic single phase speed controller.1 x COM-31 x Curved Blade Grille 600x600 (2way blow)1 x ELTA - Single Phase Transformer 4amps1 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x AIRVENT speed control - AIR4019611 x EFSC-6N- Single Phase Speed Control1 x JSR 200 Painted RAL50181 x Circular Ceiling Diffuser - TST 2001 x Round ceiling diffuser 400mm3 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Circular Ceiling Diffuser - TST 1601 x Elta 6 Amp Electronic single phase speed controller.3 x Helios TSW 3 Amp Transformer speed controller3 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan1 x ELTA - Single Phase Transformer 10amps1 x Helios TSW 7.5 Amp Transformer speed controller1 x Round ceiling diffuser 200mm1 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Push Timer Switch - ZA41 x Balance S Diffuser - NO RING - 100mm1 x PCA Diffuser - PCA-2501 x Vent Axia ACM 125 inline mixed flow duct fan1 x Three Phase Transformer controllers - RMT 1.5 Amp
BD9/9 centrifugal M4 0.35Kw
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