What is it? - Steph has the answer! (once again)
By Terry Biddlecombe, ; posted March 17, 2007; hits 1850
| It's an 84A Interrupter (so called), also known as a pole changer. It's a DPDT vibrator that converts a DC battery supply of ~100VDC into a 20 Hz ringing current square wave. There are different letter suffix version whose motor magnet voltages vary but they all require a 100 VDC battery supply for the inverted voltage. 84A is supposed to run from an 11 cell exchange battery (20-28 VDC). They were used on early manual switchboards. Steph Kerman |
Back
