• Model:RTRDU7.0

RTRDU 3 Phase Trickle & Boost 5 Step Speed Controller - 7 Amps

£ 1,044.99 (excl. VAT)

£ 1,253.99 (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 Elta Variable Speed Drive IP66 - 0.75KW1 x FU 22 25 Frequency Inverter1 x FU 075 52 Frequency Inverter (IP20)1 x FRQ5-4A V2 Inverter Speed Controller1 x Helios TSD 5.5 Transformer Speed Control (400v)1 x FRQ-10A V2 Inverter Speed controller1 x FU 15 40 Frequency Inverter1 x FRQ5-10A Inverter Speed controller1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 4.0KW1 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 Frequency converter RUCK - FU 075 381 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)1 x ELTA - Three Phase Transformer 3amps1 x ELTA - Three Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x Circular Ceiling Diffuser - TST 1251 x NKS-D swirl diffuser v-300 x 300mm1 x Circular Ceiling Diffuser - TST 1001 x Curved Blade Grille 600x600 (2way blow)1 x Round ceiling diffuser 400mm1 x Circular Ceiling Diffuser - TST 2001 x Circular Ceiling Diffuser - TST 1601 x JSR 200 Painted RAL50181 x Balance S Diffuser - NO RING - 100mm1 x Round ceiling diffuser 300mm1 x Round ceiling diffuser 200mm1 x Round ceiling diffuser 250mm1 x PCA Diffuser - PCA-2501 x Round ceiling diffuser 350mm2 x Remote Timer Control - 13511 x Run On Timer - 5s - 4hrs - RT5A3 x Push Timer Switch - ZA41 x Helios ZNE Electronic Fan Overrun Timer3 x Multi Input Run On Timer - 0 - 20min - CFCU1 x Time Delay Unit - DT20B1 x 7 Day Programmable TIMECLOCK2 x Frequency converter FU 075 14 - IP661 x Elta 10 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 2amps2 x Electronic extractor fan speed controller - FSC 1.51 x EC6H - Reversible Group Fan Electronic Controller1 x Elta 2 Amp Electronic single phase speed controller.1 x Versio Square Ceiling Diffusers - RS141 x Elta 3 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 8amps2 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 16amps1 x EFSC-3N- Single Phase Speed Control1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 12amps1 x AIRVENT speed control - AIR4019611 x ELTA - Single Phase Transformer 4amps1 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)4 x COM-31 x EFSC-6N- Single Phase Speed Control1 x Elta 6 Amp Electronic single phase speed controller.1 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)2 x Transformer 5 Speed Controller - ATC1-12TK1 x Vent Axia ACM 150 inline mixed flow duct fan6 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan2 x Vent Axia ACM 100 inline mixed flow duct fan6 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan2 x Helios TSW 7.5 Amp Transformer speed controller2 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-42 x Transformer 5 Speed Controller - ATC1-10TK2 x Transformer 5 Speed Controller - ATC1-4TK3 x Three Phase Transformer controllers - RMT 1.5 Amp1 x Airvent ceiling fan controller5 x Vent Axia ACM 125 inline mixed flow duct fan1 x ELTA - Single Phase Transformer 10amps2 x Transformer 5 Speed Controller - ATC1-8TK1 x Remote controller FLEX - for VEKO INT2 x Helios TSW 3 Amp Transformer speed controller1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)3 x CS2 Current Switch2 x Temperature Fan Speed Controller - ATCP4-WMS2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Helios TSW MCB Amp Transformer speed controller3 x Systemair Save Connect 2.0 Internet Module2 x MV-B Dual Switch for use with Helios HQW plate fans,3 x Vent Axia ACM 200 inline mixed flow duct fan5 x Single phase speed controller by auto-transformer - RMB 1.5 Amp3 x Isolator Switch - ISOSW2 x MWS 3 – Transformer Controller With Motor Protection3 x Single phase speed controller by auto-transformer - RMB 3.5 Amp2 x Helios TSW 1.5 Amp Transformer speed controller1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven2 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)1 x RRB- transformer controller2 x TG-K Duct temperature sensor1 x TTC-2000 Three phase electric heater controller1 x WS - Reversing Switch from Helios Fans1 x DEF-140T Inlet Guard for the CBT-100N1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x Single phase speed controller by auto-transformer - RMB 8.0 Amp1 x MWS 1.5 – Transformer Controller With Motor Protection1 x ACO8AC/EC AutoChangeover panel1 x ACOAS/ AC/EC Auto Changeover 8Amp1 x Two Speed Switch - REGUL-21 x Helios HQW-200/2 - IP551 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x Envirovent G4 Filter - SL-G4/F71 x Vent Axia T-Series Controller1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x Helios HQW-630/4 - IP551 x EC-Vent control board1 x Transformer (silent) speed controller - RE 3.0 Amp1 x Elta ACO Panel 149-ACO14E1 x Transformer Speed Control - RTRE- 12.0Amp1 x CONTROL ECOWATT - Basic1 x REE-1 Electronic Speed Controller1 x RDS 7 Helios Transformer Controller With Motor Protection1 x CBS-60 Outlet Flange for CSB/CBT-601 x TG-K3/NTC10-01 - Duct temperature sensor
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