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Green Efficient

Dimmer Dot air cooled units are a cost effective, trouble free device to provide continuously adjustable voltage for AC supply equipment. Air cooled units are light weight and easily transported. When used correctly they give many years of reliable service.

  • Brand: Dimmerdot / Greendot
  • Delivery: Ex Stock / Next day
  • Design: Benchtop / Panel Mount
  • Certification: IS 5142

Common Applications include:

  • Control of AC voltage and current in testing and developing work.
  • Over voltage and under voltage tests.
  • New or faulty electrical equipment – appliance testing. Gradual application of voltage to detect for any high fault current.
  • Lighting control in theatres, auditoriums, photographic studios, dark rooms, hotels, restaurants, rearing houses, etc.
    (Not recommended for discharge on hot-cathode fluorescent lighting).
    DC voltage and current control of rectifiers, such as rectifiers for
  • Electroplating, Electrowinning, Anodising, Precious Metal Recovery, Hydrogenation,
  • Cathodic Protection, Battery plate forming.
  • Voltage control in DC power supplies and constant current supplies.
  • Regulated Output voltage control for Motor Servo type AC Stabilisers and Automatic Stabilisers
  • Voltage control for meter calibration, phase-angle control in the calibration of Watt meters and Power factor meters.
  • Motor speed control.
  • Control of electric heaters, furnaces and ovens in laboratory, pilot plant and production lines.
  • Current control for testing of circuit breakers, relays, current transformers, etc.
  • Testing of magnetic materials.

Single Phase Air Cooled - Open back / Panel mount (OB)

Open back / Panel mounts (OB) are designed to be mounted behind a panel for easy installation into electrical enclosures, where only the support bolts and control knob are protruding.

Circuit Diagram

230/240 Volt AC 50Hz Line Input to C for ‘line voltage’ Output
230/240 Volt AC 50Hz Line Input to D for ‘Over voltage’ Output

diagram1.png

D-11-OB

diagram2.png

Specifications

Single Phase Open back / Panel mount Input 230/240 Volts 50 Hz | Output 0 – 260/270 Volts
TypeNom.
Amps
Cont.
Amps
HWLMDWt
ARD-11-OB1110098842841.6
D-21-OB21.9132127117926.53.3
D-41-OB43.915519017514610.26.0
D-81-OB8717520017514610.28.5
D-101-OB10917521019215410.210
D-151-OB151219024022017610.214
D-201-OB20172152902502041419
D-281-OB28232153452952381425
TypeNom.
Amps
Cont.
Amps
ARD-11-OB11
D-21-OB21.9
D-41-OB43.9
D-81-OB87
D-101-OB109
D-151-OB1512
D-201-OB2017
D-281-OB2823

See separate oil cooled specs for larger capacity
All dimensions [mm] & weights [Kg] are approx. only

Single Phase Air Cooled - Portable / Bench top (P)

Portable / Bench top (P) are designed to sit on a bench or floor.

  • They are enclosed in a protective square casing with convenient carry handles for easy transport.
  • New square shape design enables easy mounting of external equipment, such as mounting blocks for GPO’s, etc.
  • Single Phase units have Rubber feet
  • Single Phase units can be rear mounted in an electrical enclosure, simply by removing the rubber feet.
  • Single Phase units up to 15 Amp have fitted an AC flexible cord and plug.

Circuit Diagram

230/240 Volt AC 50Hz Line Input to A for ‘Line voltage’ Output
230/240 Volt AC 50Hz Line Input to B for ‘Over voltage’ Output

Specifications

Single Phase Portable / Bench top Input 230/240 Volts 50 Hz | Output 0 – 260/270 Volts
TypeNom.
Amps
Cont.
Amps
HWLWT
D-21-P21.91551551454.5
D-41-P43.91902551959
D-81-P8722025519511
D-101-P10921525021514
D-151-P151223026524018
D-201-P201726532527022
D-281-P282326538031531
D-841-P846367044036098
TypeNom.
Amps
Cont.
Amps
D-21-P21.9
D-41-P43.9
D-81-P87
D-101-P109
D-151-P1512
D-201-P2017
D-281-P2823
D-841-P8463

See separate oil cooled specs for larger capacity
All dimensions [mm] & weights [Kg] are approx. only

Three Phase Air Cooled - Open back / Panel Mount (OB)

Open back / Panel mounts (OB) are designed to be mounted behind a panel for easy installation into electrical enclosures, where only the support bolts and control knob are protruding.

  • Three Phase OB Units are the same design as three phase portable units with outer protective case removed.
  • All Three phase units can be mounted in the vertical or horizontal plane with an additional rear mount support
  • All three coils on Three Phase units are connected in star.

Circuit Diagram

400/415 Volt AC 50Hz Line Input to A1, A2, A3 for ‘Line voltage’ Output
400/415 Volt AC 50Hz Line Input to B1, B2, B3 for ‘Over voltage’ Output

Specifications

Three Phase Open back / Panel Mount Input 400 / 415 Volts 50 Hz | Output 0 – 450 / 470 Volts
TypeNom.
Amps
Cont.
Amps
HWLMDWt
D-23-OB21.940012711792611
D-43-OB43.94801901751461020
D-83-OB875201901751461027
D-103-OB1095202101921541032
D-153-OB15125352402201761044
D-203-OB20176752902502041258
D-283-OB28236903453002381280
TypeNom.
Amps
Cont.
Amps
D-23-OB21.9
D-43-OB43.9
D-83-OB87
D-103-OB109
D-153-OB1512
D-203-OB2017
D-283-OB2823

See separate oil cooled specs for larger capacity
All dimensions [mm] & weights [Kg] are approx. only

Three Phase Air Cooled - Portable / Bench Top (P)

Portable / Bench tops (P) are designed to sit on a bench or floor.

  • They are enclosed in a protective square casing with convenient carry handles for easy transport.
  • New square shape design enables easy mounting of external equipment, such as mounting blocks for GPO’s, etc.
  • Three Phase units have ball transfer or fixed feet.

Circuit Diagram

400/415 Volt AC 50Hz Line Input to A1, A2, A3 for ‘Line voltage’ Output
400/415 Volt AC 50Hz Line Input to B1, B2, B3 for ‘Over voltage’ Output

Three-Phase-Circuit-Diagram.png

Specifications

Three Phase Portable / Bench Top Input 400/415 Volts 50 Hz | Output 0 – 450/470 Volts
TypeNom. 
Amps
Cont.
Amps
HWLWt
D-23-P21.941016514514
D-43-P43.951025021026
D-83-P8755025020033
D-103-P10955028022540
D-153-P151255531024553
D-203-P201767040532073
D-283-P282370044037095
TypeNom. 
Amps
Cont.
Amps
D-23-P21.9
D-43-P43.9
D-83-P87
D-103-P109
D-153-P1512
D-203-P2017
D-283-P2823

See separate oil cooled specs for larger capacity
All dimensions [mm] & weights [Kg] are approx. only

Other photos

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