• 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 Variable Speed Drive IP66 - 2.2KW1 x FRQ5-4A V2 Inverter Speed Controller1 x Elta Variable Speed Drive IP66 - 4.0KW1 x ELTA - Three Phase Transformer 3amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x Electronic extractor fan speed controller - FSC 1.51 x EC6H - Reversible Group Fan Electronic Controller1 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 8amps1 x Circular Ceiling Diffuser - TST 1601 x EFSC-3N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 16amps1 x Airvent ceiling fan controller1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 12amps1 x Balance S Diffuser - NO RING - 100mm1 x Round ceiling diffuser 200mm1 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps1 x COM-31 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x Round ceiling diffuser 300mm1 x EFSC-6N- Single Phase Speed Control1 x PCA Diffuser - PCA-2501 x ELTA - Single Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)3 x FU 15 40 Frequency Inverter3 x Helios TSD 5.5 Transformer Speed Control (400v)3 x FRQ-10A V2 Inverter Speed controller1 x Helios VDS-7 Three Phase Transformer 5-Step1 x FU 22 25 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 0.75KW1 x PCA Diffuser - PCA-3151 x JSR 200 Painted RAL50181 x Three Phase Transformer controllers - RMT 1.5 Amp2 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x FU 075 52 Frequency Inverter (IP20)2 x Frequency converter FU 075 14 - IP662 x Frequency converter RUCK - FU 075 202 x Elta Variable Speed Drive IP66 - 1.5KW2 x FU 15 16 Frequency Inverter2 x Elta Variable Speed Drive IP66 - 5.5KW2 x FRQ5-10A Inverter Speed controller2 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)2 x ELTA - Three Phase Transformer 10amps2 x Elta 10 Amp Electronic single phase speed controller.2 x Remote controller FLEX - for VEKO INT2 x ELTA - Single Phase Transformer 2amps2 x NKS-D swirl diffuser v-300 x 300mm2 x Circular Ceiling Diffuser - TST 1251 x Balance S Diffuser - NO RING - 125mm1 x Circular Ceiling Diffuser - TST 2001 x Curved Blade Grille 600x600 (2way blow)2 x Elta 2 Amp Electronic single phase speed controller.2 x Round ceiling diffuser 400mm1 x Elta 3 Amp Electronic single phase speed controller with TK1 x Versio Square Ceiling Diffusers - RS141 x Vent Axia ACM 150 inline mixed flow duct fan1 x Elta 6 Amp Electronic single phase speed controller.1 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)1 x Round ceiling diffuser 250mm1 x Round ceiling diffuser 350mm1 x Transformer 5 Speed Controller - ATC1-8TK2 x Push Timer Switch - ZA41 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A1 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B1 x 7 Day Programmable TIMECLOCK1 x TTC-2000 Three phase electric heater controller2 x Elta Variable Speed Drive IP66 - 7.5KW1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 x CONTROL ECOWATT - Basic1 x EM30-24 Electro-Mechanical Control Panel1 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans1 x Vent Axia ACM 125 inline mixed flow duct fan1 x CS2 Current Switch1 x ACO 149-ACO1/EDV1 x Single phase speed controller by auto-transformer - RMB 8.0 Amp
Reviews
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