APL datasheet(4/18 Pages) SENSATA

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Series Trip

The most popular configuration for magnetic protectors is the

series trip where the sensing coil and contacts are in series

with the load being protected. The handle position

conveniently indicates circuit status. In addition to providing

conventional over-current protection, it’s simultaneously used

as an on-off switch.

Auxiliary Switch

(Applies to Series Trip Only)

This is furnished as an integral part of a series pole in

single or multi-pole assemblies. Isolated electrically from

the protector’s circuit, the switch works in unison with

the power contacts and provides indication at a remote

location of the protector’s on-off status.

Auxiliary switch contacts actuate simultaneously with the

main breaker contacts, and will open regardless of whether

the breaker contacts are opened manually or electrically. For

auxiliary switch ratings below 6Vac or 5Vdc, an auxiliary

switch with gold contacts is available. Gold contacts are not

recommended for load current above 100 milliamps.

The contacts on our optional RS auxiliary switch will open

only in the event of an electrical trip of the circuit breaker.

Shunt Trip

The shunt trip is designed for controlling two separate loads

with one assembly. The control is established by providing

overload protection for the critical load. When the current

through this load becomes excessive and reaches the trip

point, the protector will open and remove power from both

loads simultaneously. The total current rating of both loads

must not exceed the maximum contact rating.

Relay Trip

This permits the overload sensing coil to be placed in a

circuit which is electrically isolated from the trip contacts.

The coil may be actuated by sensors monitoring pressure,

flow, temperature, speed, etc. Other typical applications

include crowbar, interlock and emergency/rapid shutdown

circuitry. Trip may be accomplished by voltage or current,

which must be removed immediately upon tripping.

Dual Coil

Dual coil protectors provide remote shut down option and

normal overcurrent protection in the confines of a single

breaker pole. This construction saves space by eliminating the

need for an additional pole for the voltage trip function.

Voltage Trip

Sometimes called “dump circuits” or “panic trip circuits,”

these units make it possible to open main power contacts

with lower power inputs from one or more sources. This

configuration is becoming increasingly more important for

sensitive circuitry and denser packaging in automation

systems. Available in series, shunt, relay or dual coil

configurations.

APL/UPL CONFIGURATIONS

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