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EV.6.4 Accumulator Isolation Relays - AIR‌

EV.6.4.1 Every Accumulator Container must contain minimum one fuse (EV.7.6) and two or more Accumulator Isolation Relays (AIR)

EV.6.4.2 The Accumulator Isolation Relays must:

a. Be a Normally Open type

b. Open both poles of the Accumulator

EV.6.4.3 When the AIRs are open, High Voltage EV.1.1 must not be present outside of the Accumulator Container.

EV.6.4.4 The fuse protecting the Accumulator Tractive System circuit must have a rating lower than the maximum switch off current of the Accumulator Isolation Relays.

EV.6.4.5 The Accumulator Isolation Relays and any fuses must be separated from the rest of the Accumulator with an electrically insulated and Nonflammable Material (F.1.18).

EV.6.4.6 A capacitor may be used to hold the AIRs closed for up to 250 ms after the Shutdown Circuit is opened EV.8.2.2

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