• 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

4 x Elta 3 Amp Electronic single phase speed controller with TK2 x Transformer Speed Control - RTRE- 5.0Amp2 x Helios TSW 0.3Amp Compact Transformer speed controller2 x Helios HQW-200/2 - IP553 x Elta 6 Amp Electronic single phase speed controller with TK1 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans2 x MV-B Dual Switch for use with Helios HQW plate fans,1 x UB47- Universal Insulated Terminal2 x Elta 6 Amp Electronic single phase speed controller.2 x Helios ESA-1 Surface mounted Speed Control 1amp2 x RD35S-4DW.6W.3L - 122297 (Three Phase)2 x DPD 12PM Delivery Surcharge1 x RDH Flange - 04001 x MWS 1.5 – Transformer Controller With Motor Protection2 x Transformer (silent) speed controller - RE 1.5 Amp1 x Silent 100 Window Kit - windowS1 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x Speed Controller - REB11 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)2 x AIRVENT speed control - AIR4019611 x Elta SCP400/4-1AC - IP551 x ACOAS/ AC/EC Auto Changeover 8Amp2 x EC6H - Reversible Group Fan Electronic Controller1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven1 x Transformer (silent) speed controller - RE 3.0 Amp1 x WS - Reversing Switch from Helios Fans1 x REB-CVF 0-10v Controller1 x Speed Controller - REB1-N1 x Transformer Speed Control - RTRE- 3.0Amp1 x CBT-100N Centrifugal1 x EBM-Papst D4E225-BC01-17 Double inlet1 x HIMF - Mixed Flow Fan 125mm Inline Fan2 x ELTA - Single Phase Transformer 2amps2 x RDH Flange - 02502 x Multi Input Run On Timer - 0 - 20min - CFCU1 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x PM230-TF, AC 230V Damper Actuator, Spring Return, 2 x SPDT, 72C Thermal Fuse1 x Temperature Fan Speed Controller - ATCP4-FLS1 x Isolator Switch - ISOSW1 x TD EVO-100 PF ECOWATT - Environmentally Friendly Energy Efficient Inline Fan1 x TEM 035 - 5 Speed Transformer Speed Control1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x Speed Controller - REB32 x Airvent ceiling fan controller1 x DDMP 12-12 3F 1810W M6A4 DG01 x Vent Axia Silent 100T (TIMER)1 x Helios HQW-250/4 - IP551 x Transformer Speed Control - RTRE- 1.5Amp1 x Duct Termination with Mesh - 710mm1 x Silentub - STUB 1001 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x Vent Axia T-Series Wall Model TX9WL2 x ELTA - Single Phase Transformer 8amps1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x ELTA - Single Phase Transformer 4amps1 x Elta Variable Speed Drive IP66 - 0.75KW (1ph to 3ph)1 x EFSC-6N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 10amps1 x Elta Variable Speed Drive IP66 - 1.5KW (1ph to 3ph)1 x Run On Timer - 5s - 4hrs - RT5A1 x Remote Timer Control - 13511 x Push Timer Switch - ZA42 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x Elta Wall Cowl SWC56/631 x Elta Louvre Shutter - 400mm2 x GRA-100 External Grill by S&P2 x MTS10- extractor fan 3 step switch1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Elta Wall Cowl SWC25/311 x Duct Termination with Mesh - 355mm1 x Elta Wall Cowl SWC45/501 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3001 x Jet Cowl - 315mm1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7101 x CO2 Room Sensor - CO2-R1 x Single Deflection Grille 400mm with OBD damper1 x Contactor Interface Station - CI91 x Duct Termination with Mesh - 450mm1 x Non Vision 150mm x 150mm (Air Transfer) Grille - With Flange - MILL FINISH1 x Mini Diffuser - 100mm1 x Comefri - TLZ 225 R - High Performance Scroll Fan1 x Egg Crate Grille with Dust panel filter 1 inch- 300x3001 x Spiral Ducting 1 meter - 200mm1 x Envirovent Silent MV160/100S Mixvent - 100mm - (5 year warranty)1 x Universal Pipe Fixing Clip1 x HXP450/6-1 - 6 Pole - Single Phase1 x KBA- Inlet Mounting 1801 x 220x90mm x 1m Insulated Rectangular Duct1 x 125mm Round Connector with Damper1 x RDH Flange - 03151 x Rectangular Airbrick Adaptor1 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan1 x Elta Variable Speed Drive IP66 - 7.5KW1 x FU 15 40 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 2.2KW1 x FU 075 52 Frequency Inverter (IP20)1 x Helios VDS-7 Three Phase Transformer 5-Step1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 5.5 Transformer Speed Control (400v)1 x Frequency converter RUCK - FU 075 201 x Frequency converter FU 075 14 - IP661 x FU 22 25 Frequency Inverter2 x Elta Variable Speed Drive IP66 - 0.75KW1 x FRQ5-4A V2 Inverter Speed Controller2 x ELTA - Three Phase Transformer 3amps1 x Inverter - IDDXF54-2.21 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)2 x Elta Variable Speed Drive IP66 - 2.2KW (1ph to 3ph)1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x FRQ5-10A Inverter Speed controller1 x Elta 10 Amp Electronic single phase speed controller.1 x FU 22 04 Frequency Inverter1 x Frequency converter RUCK - FU 075 211 x FU 075 04 Frequency Inverter (IP20)2 x Electronic extractor fan speed controller - FSC 1.51 x Transformer 5 Speed Controller - ATC1-4TK1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 16amps2 x COM-31 x ELTA - Single Phase Transformer 12amps1 x Flakt Woods ME 1.1 speed controller 1amp - EA9011571 x 7 Day Programmable TIMECLOCK1 x Speed Controller - REB51 x REE-2 Electronic Speed Controller1 x Easy-fix termination kit - High Rise Ventilator - EFT1 x SG-200 Fan Guard for the HQW 2001 x Helios HQW-315/4 - IP551 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x Transformer Speed Control - RTRE- 7.0Amp1 x Temperature Controller - EDTW1 x Elta HXP 800mm 6-Pole (Three Phase)1 x KBA- Inlet Mounting 2252 x Comefri - TLZ 560 R - High Performance Scroll Fan1 x Elta SCP500/4-1AC - IP551 x ADH E0-450 Flange - 0450 ADHE/RDHE1 x Duct Termination with Mesh - 200mm1 x Same Day Shipping Surcharge - City Sprint1 x REU 1.5amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Three Phase Transformer controllers - RMT 1.5 Amp1 x Vent Axia ACM 200 inline mixed flow duct fan1 x Vent Axia ACM 125 inline mixed flow duct fan1 x KMBI 225 Connector rectangular/circular to install on the discharge of CMT1 x Single phase speed controller by auto-transformer - RMB 1.5 Amp1 x Two Speed Switch - REGUL-21 x Envirovent G4 Filter - SL-G4/F71 x RDH FLEX-SQUARE - ADH/RDH 04501 x PIR Sensor - PIR41 x QPTW 250C Acoustic Twin Fan with Controller1 x Compact SCD450/4-1AC1 x 204x60mm Insulated Rectangular Vertical 45° Bend1 x Speed Controller - REB161 x KBA- inlet mounting flange for CRMT 2501 x CK-60F Kit1 x Duct Termination with Mesh - 100mm1 x GXC6EC - High Performance Extract Fan1 x Duct Termination with Mesh - 250mm1 x Singleflow SSDL315-1EC1 x CBA-100 Inlet Flange for CBT-1001 x CBM 7/7 147w 4P RE-VR1 x CBM Low Pressure Centrifugal Fan - CBM 12/12 6 Pole 736watt CVR1 x Round ceiling diffuser 300mm1 x Biflow SB250-CON4-3 - High Temperature Bifurcated Fan1 x Twinflow STDL315-1EC1 x Potentiometer EGH 01 - for DDMP Fans1 x CBM Low Pressure Centrifugal Fan - CBM 9/9 4 Pole 550watt C VR1 x Northern Ireland Pallet Surcharge1 x FAST-TRACK RANGE 75mm - Seal Ring (1 bag of 10)1 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Remote controller FLEX - for VEKO INT1 x Transformer 5 Speed Controller - ATC1-2TK1 x Vent Axia ACM 150 inline mixed flow duct fan
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