Motorised dimmers for A.C. tungsten lighting loads are designed to be connected in series with the phase supply to a distribution board, and therefore the only fuse fitted is to protect the control circuit. Supplied internally wired and with metal covers. State type ref., circuit wattage and voltage when ordering.
Three phase models can be used for three separate sub-circuits single phase.
Up-Down-Stop Fixed Load (Table 1)| Theatre Rating | Constant Rating | ||||||
| Type | Phases | KW per phase | Type | Phases | KW per phase | ||
| 220-250v | 110-120v | 220-250v | 110-120v | ||||
| Auto 5 | 1 | 3.5 | 2.5 | Auto 5C | 1 | 3 | 2 |
| Auto 6 | 1 | 5 | - | Auto 6C | 1 | 4 | 2.5 |
| Auto 6A | 1 | 7 | 5 | Auto 6AC | 1 | 6 | 4 |
| Auto 71 | 1 | 10 | - | Auto 71C | 1 | 8 | 5 |
| Auto 72 | 2 | 5 | - | Auto 72C | 2 | 4 | 2.5 |
| Auto 81 | 1 | 15 | - | Auto 81C | 1 | 12 | 7.5 |
| Auto 83 | 3 | 5 | - | Auto 83C | 3 | 4 | 2.5 |
| Type | Phases | Colour | kW per phase | Max.Demand kW | ||
| 220-250v | 110-120v | 220-250v | 110-120v | |||
| Auto 12 | 1 | 3 | 2.5 | 2 | 5 | 4 |
| Auto 12A | 1 | 3 | 3.5 | 2.5 | 7 | 5 |
| Auto 13 | 1 | 4 | 2.5 | 2 | 5 | 4 |
| Auto 13A | 1 | 4 | 3.5 | 2.5 | 7 | 5 |
| Auto 14 | 1 | 3 | 5 | - | 10 | - |
| Auto 15 | 1 | 4 | 5 | - | 10 | - |
| Auto 22 | 3 | 3 | 2.5 | 2 | 15 | 12 |
| Auto 22A | 3 | 3 | 3.5 | 2.5 | 21 | 15 |
| Auto 23 | 3 | 4 | 2.5 | 2 | 15 | 12 |
| Auto 23A | 3 | 4 | 3.5 | 2.5 | 21 | 15 |
| Auto 24 | 3 | 3 | 5 | - | 30 | - |
| Auto 25 | 3 | 4 | 5 | - | 30 | - |
Up-Down-Stop Variable Load (Table 3)
Up down stop control of variable load transformer dimmers which have been specially designed to control A.C. tungsten lighting. 220/250 volt only.
Dimmers open circuit at lower limit of travel.
| Type | Phases | kW per phase |
| Auto TR1 | 1 | Variable to 5kW max. |
| Auto TR2 | 2 | Variable to 5kW max. |
| Auto TR3 | 3 | Variable to 5kW max. |
From Lighting for Entertainment 1963-4
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