Warner Electric SK-U1Z User Manual

P-2025-WE
Part # 601-6119-016

Safety Interlock Switch

Model SK-U1Z

Installation Instructions

Description

L1

Safety Switch with positive opening normally
closed contacts which can only be activated
with a specially designed mating key that
protects against unintended operation.

Electrical Features

Rated Voltage: 500V AC max.

Rated Current: 10 A max. sustained current

CSA: 10A, 300VAC, A300, same polarity

Features

• Easy installation

• Actuator head can be oriented to 4 different

approach directions quickly and easily

• Positive opening of the normally closed

contacts for safety

• UL/CSA listed

• NEMA-4 rating

• Easy wiring access

• 3 cable entry holes with PG11 threads

• 1/2” NPT conduit adaptor supplied with switch -
part #399-8000-116

• Strain relief adaptors are available to order -
part # 323-0211-089

Mechanical Features

Enclosure: Thermoplastic, glass fiber

reinforced

Actuator: Separate Actuator, Aluminum (M5

dia mounting holes) with plastic
snap cover

Switch 2 x M5 round and 2 x M5
Mounting: elongated holes

Utilization Categories per IEC 945-5-1,
AC = 15
DC = 13

Approvals

UL/CSA

Standards

VDE 0113
VDE 0660 Part 200
IEC 947-5-1
GS-ET 15

Safety Switch Contacts with Key Installed

Fuse

11 12

Stop

23 24

Start

M

L2

M

Operational

Temperature: -30ºC/+80ºC (-22ºF/+176ºF)

Contact 1 N.O. -1 N.C. with forced
Type: disconnect of N.C. contacts

Special wiring for the safety-interlock switch to
prevent tampering. The N.O. contact 23-24 short
circuits the coil of the motor starter (M) with key

Mechanical
Life: 1 million switch operations

removed. If the N.C. contact 11-12 were jumpered,

the fuse would blow when the key is removed from
the switch and an attempt is made to restart the

Protection: IP 65/Nema 4

Termination: 4 screw terminal connections M3.5

screws

2 Warner Electric • 800-825-9050 P-2025-WE • 11/12

circuit.

Note: Fuse to be 10 Amp slow acting or 16
Amp fast acting type.