A one or two pole electrical interlock can be added to the disconnect switch or circuit breaker. Thus, if a separate control circuit is used, the magnetic starter can be de-energized when the disconnect is switched to the OFF position. See
Table 16.97 for proper interlock selection. For electrical ratings of disconnect and circuit breaker interlocks, see
Table 16.98 below.
An electrical interlock may also be factory installed in either a disconnect switch or circuit breaker combination starter. Specify
Form Y74 for single pole, or
Form Y75 for two pole interlocks. For pricing see factory modifications (Forms).
These 100 VA kits are designed specifically to allow for field modification of NEMA Size 0, 1 and 2 combination starters that require a control power transformer. The kit includes a 9070TF100 fused transformer on a special mounting plate for ease of placement and installation on the combo starter back pan. A wire harness (with wiring diagrams) is included to complete the kit.
Internal Auxiliary Switch—Circuit breakers can be supplied with a factory installed auxiliary switch for remote indication of an open and/or tripped or a closed breaker. One (specify
Form Y741) or two (specify
Form Y751) auxiliary switches can be supplied. The switches are supplied with normally open and normally closed circuits with a common connection. Contacts must be used on the same polarity and are rated 15 Amps at 240 Vac. The auxiliary switches are located internally and are furnished with 19-20 inch long leads.
Alarm Switch—The alarm switch only operates when the breaker is tripped. It is used to actuate bell alarms and warning lights. The alarm switch is factory installed only (specify
Form Y742) and consists of a single pole single throw switch which is normally open except when the breaker is tripped. The contacts are rated 4 Amps at 240 Vac. This switch is located in the breaker and is supplied with 19-20 inch long leads.
Transformer Selection—Space and drilling are provided in all disconnect switch and circuit breaker combination starters in NEMA 1, 4 & 4X stainless and polyester, 12 and 7 & 9 bolted enclosures for the field addition (or factory installation) of a Class 9070 control circuit transformer and Class 9999 Type SFR4 fuse holder. This kit can be either panel mounted or side mounted on the Type S starter. For standard control transformer selection in combination starters, see
Table 16.100. Consult field office for transformer additions to NEMA 7 & 9 SPIN TOP
® enclosures. For secondary fuse holder order 9080PF1.
Fuse Block Mounting Brackets—The standard capacity transformer, Class 9070 Type T100, for the Size 0 and 1 starters mounts to the right of the magnetic starter.
Standards—Most combination starters and forms are UL Listed in file E152395, Category NKJH, and CSA File CR 584.
