• 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

3 x Elta 10 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 2amps3 x Electronic extractor fan speed controller - FSC 1.52 x EC6H - Reversible Group Fan Electronic Controller3 x Elta 3 Amp Electronic single phase speed controller with TK1 x Elta 3 Amp Electronic single phase speed controller.1 x ELTA - Single Phase Transformer 8amps4 x Elta 6 Amp Electronic single phase speed controller with TK1 x ELTA - Single Phase Transformer 16amps1 x ELTA - Single Phase Transformer 12amps2 x Elta Variable Speed Drive IP66 - 0.37KW (1ph to 3ph)1 x ELTA - Single Phase Transformer 4amps2 x AIRVENT speed control - AIR4019612 x Elta 6 Amp Electronic single phase speed controller.1 x EFSC-6N- Single Phase Speed Control1 x ELTA - Single Phase Transformer 10amps1 x TTC-2000 Three phase electric heater controller1 x ACOAS/ AC/EC Auto Changeover 8Amp2 x ACO8AC/EC AutoChangeover panel1 x Elta ACO Panel 149-ACO14E1 x EC-Vent control board1 x CONTROL ECOWATT - Basic1 x ACO 149-ACO1/EDV1 x U-EK plastic housing IP65 - for use with the U-EK230E Motor Protection1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 5001 x EC-Vent Room Unit3 x Systemair Save Connect 2.0 Internet Module1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 6301 x Elta ACO Panel 149-ACO18B1 x Easy-fix termination kit - High Rise Ventilator - EFT1 x EM30-24 Control Panel Commissioning Service1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 3551 x Elta Wall Cowl SWC56/631 x Elta Wall Cowl SWC35/402 x HCFC 1.7 - Reversible Speed Controller for HCF sweep fans4 x Single phase speed controller by auto-transformer - RMB 1.5 Amp3 x Single phase speed controller by auto-transformer - RMB 3.5 Amp1 x Helios ZNE Electronic Fan Overrun Timer1 x Time Delay Unit - DT20B1 x 7 Day Programmable TIMECLOCK2 x Remote Timer Control - 13511 x Speed Controller - REB1-N2 x Multiflow SMB550/4-1AC2 x REB-CVF 0-10v Controller3 x Speed Controller - REB13 x PIR Sensor - PIR23 x Vent Axia Silent 100T (TIMER)3 x QPTW 250C Acoustic Twin Fan with Controller2 x PIR Sensor - PIR42 x UB47- Universal Insulated Terminal1 x Elta Louvre Shutter - 400mm1 x Elta Wall Cowl SWC45/501 x Elta Wall Cowl SWC25/314 x Multi Input Run On Timer - 0 - 20min - CFCU5 x Vent Axia ACM 100 T (Timer Model) inline mixed flow duct fan5 x Vent Axia ACM 125 T (Timer Model) inline mixed flow duct fan1 x Vent Axia ACM 150 T (Timer Model) inline mixed flow duct fan2 x S&P MULTI-REG EC FAN CONTROLLER / INTERFACE3 x Transformer 5 Speed Controller - ATC1-4TK2 x Transformer 5 Speed Controller - ATC1-10TK1 x NKS-D swirl diffuser v-300 x 300mm1 x Circular Ceiling Diffuser - TST 1251 x Balance S Diffuser - NO RING - 125mm1 x Circular Ceiling Diffuser - TST 1001 x PCA Diffuser - PCA-3153 x Push Timer Switch - ZA41 x JSR 200 Painted RAL50181 x Curved Blade Grille 600x600 (2way blow)1 x Round ceiling diffuser 400mm1 x Circular Ceiling Diffuser - TST 1602 x Vent Axia ACM 150 inline mixed flow duct fan1 x Balance S Diffuser - NO RING - 100mm1 x Round ceiling diffuser 200mm1 x Round ceiling diffuser 300mm4 x Helios TSW 1.5 Amp Transformer speed controller1 x Round ceiling diffuser 250mm2 x Vent Axia ACM 100 inline mixed flow duct fan4 x Helios TSW 3 Amp Transformer speed controller3 x Vent Axia ACM 125 inline mixed flow duct fan1 x CMT-2 200/80 1.1KW - Single inlet centrifugal fan direct driven2 x CS2 Current Switch2 x Single phase speed controller by auto-transformer - RMB 8.0 Amp3 x Envirovent Silent MV160/100T Mixvent - Timer Model - 100mm - (5 year warranty)2 x Vent Axia T-Series Controller1 x TG-K Duct temperature sensor1 x Helios HQW-200/2 - IP551 x Transformer Speed Control - RTRE- 12.0Amp1 x REE-1 Electronic Speed Controller1 x Helios HQW-630/4 - IP553 x Transformer (silent) speed controller - RE 3.0 Amp1 x KMBI 180 Connector rectangular/circular to install on the discharge of CMT1 x Transformer (silent) speed controller - RE 5.0 Amp1 x Commercial Single or 3 phase Fan Reversing Switch - RS15 x WS - Reversing Switch from Helios Fans2 x Helios HQW-315/4 - IP554 x MTP 10, 10K, Speed control3 x Elta Variable Speed Drive IP66 - 2.2KW1 x DEF-CBM-RE-7 - Protection Guard1 x Silent 100 Window Kit - windowS1 x Speed Controller - REB2.5-N1 x FRQ5-4A V2 Inverter Speed Controller1 x FRQ-10A V2 Inverter Speed controller1 x Helios TSD 3.0 Transformer Speed Control (400v)1 x Elta Variable Speed Drive IP66 - 7.5KW1 x Frequency converter FU 075 14 - IP663 x Elta Variable Speed Drive IP66 - 0.75KW1 x FU 075 52 Frequency Inverter (IP20)1 x FU 22 25 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 1.5KW1 x Frequency converter RUCK - FU 075 201 x Elta Variable Speed Drive IP66 - 4.0KW2 x FRQ5-10A Inverter Speed controller1 x FU 15 16 Frequency Inverter1 x Elta Variable Speed Drive IP66 - 5.5KW1 x Frequency converter RUCK - FU 075 211 x FU 22 04 Frequency Inverter1 x ELTA - Three Phase Transformer 3amps1 x ELTA - Three Phase Transformer 10amps1 x ATEX rated 3-phase Speed Control - R-DK4 KT (EX)2 x Helios TSW 0.3Amp Compact Transformer speed controller1 x Helios - FIUK-11KW 24.0A - FREQUENCY INVERTER1 x FU 075 04 Frequency Inverter (IP20)2 x Remote controller FLEX - for VEKO INT2 x Helios TSW MCB Amp Transformer speed controller1 x Transformer 5 Speed Controller - ATC1-8TK2 x Vent Axia ACM 200 inline mixed flow duct fan1 x PCA Diffuser - PCA-2503 x Transformer speed controller - ATC1 - 1.5 Amps2 x Envirovent 4 Way Remote Control Switch - SWHBKRF-41 x Temperature Fan Speed Controller - ATCP4-WMS2 x Speed controller with Reverse - REB-1R2 x Helios TSW 7.5 Amp Transformer speed controller2 x REU 7amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost3 x Isolator Switch - ISOSW1 x Run On Timer - 5s - 4hrs - RT5A1 x Vent Axia SC5001 - Speed controller1 x ERR 20/1 Centrifugal inline fan2 x Helios HQW-200/4 - IP552 x Two Speed Switch - REGUL-23 x Speed Controller - REB103 x MWS 1.5 – Transformer Controller With Motor Protection3 x Transformer Speed Control - RTRE- 7.0Amp2 x CBA-60 Inlet Flange for CBT-601 x CMT-2 225/090 1.1KW - Single inlet centrifugal fan direct driven2 x SG-200 Fan Guard for the HQW 2001 x Bathroom Fan -Envirovent- Silent 100 T (Timer Model)1 x TUNE-R-200-3-M1 - Control Damper1 x TD Mixvent 800/200 EEXEIIT32 x Helios HQW-250/4 - IP551 x Speed Controller - REB82 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt CVR1 x DDMP 12-12 3F 1810W M6A4 DG01 x Compact SCD450/4-1AC2 x MV-B Dual Switch for use with Helios HQW plate fans,1 x DEF-140T Inlet Guard for the CBT-100N1 x Helios PU10 Speed Potentiometer (Flush Mounted)1 x CBT-100N Centrifugal2 x Transformer Speed Control - RTRE- 1.5Amp1 x VEKA INT 2000/15.0-L1 EKO1 x S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 7101 x Quietflow SQS100-1ECL - Centrifugal Box Fan1 x RDS 7 Helios Transformer Controller With Motor Protection1 x Single phase speed controller by auto-transformer - RMB 10.0 Amp1 x Envirovent G4 Filter - SL-G4/F71 x TG-K3/NTC10-01 - Duct temperature sensor1 x Transformer (silent) speed controller - RE 1.5 Amp1 x CBS-60 Outlet Flange for CSB/CBT-601 x CBM 9-9 550w 4P VR (Open Motor)1 x ENV 100 12v transformer SELV1 x CBM Low Pressure Centrifugal Fan - CBM 10/10 4 Pole 550watt VR1 x KKS 100 silencer-section - For use with the MUB 100 size Fans.1 x MTS10- extractor fan 3 step switch1 x Capacitor 2uf for use with the EBM A4E range1 x REU 1.5amp Speed control - Two Speed Five-Step Transformer - Trickle and Boost1 x Speed Controller - REB161 x Jet Cowl - 315mm1 x TD160-NT Mixvent - 100mm - TD160 Timer1 x Egg Crate Grille with G2 Dust panel filter 1 inch- 300x3001 x Elta - Room Sensor - Temp/Humid/C021 x LFBR 315 G4 - Helios Inline Filter Box - 315mm2 x RDS 11 Helios Transformer Controller With Motor Protection1 x MWS 3 – Transformer Controller With Motor Protection1 x ELM 18 EX Flexible Cuff for ERM 18
Reviews
EM 250-E2M 01- Etamaster-250
EM 250-E2M 01- Etamaster-250
£ 128.80

Really well made but comes with no speed controler? ?and can...