Stearns Electronic Brake Release Indicator Catalog Page

Electronic Brake Release Indicator (Proving Switch)

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Armature-Actuated Brake Series

Indicates when the brake is released by sensing the change in the brake coil current waveform.
For use with the Series 333/350/360 brakes

Features

• Mount in remote location (control cabinet)

STEARNS ELECTRONIC PROVING
SWITCH

INPUT 414 VDC
PART NUMBER
PATENT NUMBER 6,226,167

Brake Operation

When electrical power is applied to the armature-actuated
brake coil, the armature is attracted by the electromagnetic
force generated by the magnet body, which overcomes
spring action. This allows the friction disc to rotate freely.
When electrical power is interrupted, the electromagnetic
force is removed and the pressure spring mechanically
forces the armature plate to clamp the friction disc between
itself and the pressure plate. This develops torque to stop
or hold the load.

Switch Operation

When the brake armature is pulled in to the magnet body
to release the brake, a change in the brake coil current
waveform occurs. By tracking this change in the brake coil
current, the electronic switch indicates when the brake is
released.

• Operating temperature -40°C through 65°C

• Not susceptible to common problems of
mechanical switches, such as mechanical
fatigue, tolerances, and vibration.

• Relay contacts are silver-cadmium oxide

• Utilize either normally-open contacts
(UL rated 2-20A, inductive or resistive,
at 12-240 VAC and CSA rated 10A, inductive
or resistive at 240 VAC) or normally-closed
contacts (UL rated 2-10A, inductive or resistive,
at 12-240 VAC and CSA rated 10A, inductive
or resistive, at 240 VAC)

Wiring Instructions: See sheet P/N 8-178-000-03

Dimensions

414V Unit

5.5

5.0

2xØ1.88

4.55
WIRE ENTRY

.125

3.3

1.25

2.124

Ordering Information

24V thru 240V Units

Part Number Example:

DC

Voltage*

24 024

90 090
103 103
180 180
205 205
258
414

*Standard voltages listed. For

other voltages, contact factory.

4-4-07090-XX

Characters

To Insert

258
414

Specify brake model number.
The last 2 digits of the switch
part number will depend upon
the brake size

5.5

5.0

2xØ1.88

*Standard voltages listed. For other
voltages, contact factory.

WIRE ENTRY

2.02

1.5

NOTE: Cannot be used with half-wave rectifier. Use with full-wave or TOR-AC full-wave rectifier only.

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