MIL-PRF-17773 Switches, Bus Transfer, Electric Power Automatic And ManualThis specification covers the Automatic Bus Transfer Switch \(ABT\) \(see 6.4.1\) and the Manual Bus Transfer Switch \(MBT\) \(see 6.4.13\), herein referred to as ABT, MBT, or switch\(es\), for use on surface and submarine Naval vessels. Unless otherwise specified herein, this specification applies to both ABTs and MBTs. Requirements for Static or Solid State ABTs \(SABTs\) are not defined in this specification. MIL-PRF-32150 specifies requirements for SABTs.

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MIL-PRF-17773C(SH)

1.2.3 Configuration type. Switch configuration types are as follows:

Configuration Type (CT) Description

PIN Code

ABT has:

(a) control circuit time delay (0.3 to 0.5 seconds) (see 6.4.5) and

(b) single phase protection (see 3.4.2.3.12) (see 6.4.8) on normal bus and

(d) normal seeking.

ABT has:

(a) control circuit time delay (0.3 to 0.5 seconds) and

(b) full phase protection on normal bus and

(d) normal seeking.

ABT has:

(a) control circuit time delay (0.3 to 0.5 seconds) and

(b) line circuit time delay (see 6.4.12) or in-phase monitoring (see 6.4.9)

and

(d) is normal seeking.

ABT has:

(a) single phase protection on normal bus and

(b) is instantaneous and

ABT has:

(a) control circuit time delay (0.3 to 0.5 seconds) on voltage sensing and

(b) single phase protection on normal bus and

(d) random transfer below 25 percent voltage and

(e) contains in-phase monitoring.

ABT is for DC (direct current) only and has:

(a) no line circuit time delay and

(b) single phase protection on normal bus and

ABT has:

(a) single phase protection on normal bus and

(b) senses voltage and frequency and

(d) has an operating transfer time (see 6.4.15) of 70 milliseconds

maximum upon voltage failure and

(e) is instantaneous and

(f) power seeking.