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Prosafe Trapped Key Interlock Switches

Electronic Timed-Delay Units

Description

The Electronic Timed-delay Unit (ETU) is used in applications that

require an elapsed time to occur before allowing access to a

hazardous area. The ETU uses a CU1 control unit timer to execute

the timing sequence. Turning a non removable key initiates the

timer. When the CU1 times out, its output energizes an internal

solenoid, which then allows the removal of either one or two

trapped keys.

The Single-key Timed delay Unit (STU) has one trapped key. After

the CU1 timer has expired, the single trapped key can be removed

and used to continue the next sequence in allowing access to the

hazard. The single key must be returned to the STU and trapped to

allow the non removable key to re-initiate the hazard.

The Dual-key Timed delay Unit (DTU) has two trapped keys. After

the CU1 timer has expired, both keys can be removed and used to

continue the next sequences in allowing access to the hazard. Both

keys must be returned to the DTU and trapped to allow the non

removable key re-initiate the hazard.

See the CU1 control unit for details on setting the delay time.

Features

• Timed-delay output up to 40 minutes

• Single key or Dual key

• 316L stainless steel keys

• Category 1 Stop

• Replaceable code barrel assembly

• Optional IP65 enclosure

The Prosafe Advantage

Stainless steel

construction.

Specifications

Standards

EN292-1&2, EN1954-1, IEC/EN60204-1,

EN1088, IEC/EN60947-5-1, ISO13849-

1, ISO12100-1&2, ISO14119, GS-ET-19,

AS4024.1

Category

Cat. 3 per EN 954-1 (ISO 13849-1)

Suitable for Cat. 2, 3, or 4 systems

Approvals

BG and CE marked for all applicable

directives

Operating Temperature

0°C to +40°C (32°F to +104°F)

Humidity

95% RH

Mechanical Operations

100,000

Max. Shear Force to Key

15.1kN (3398lbs)

Max. Torque to Key

14Nm (124lb•in)

Material

Trapped Key Components

Face Plate

Optional Box

316L Stainless Steel

316L Stainless Steel

ABS Plastic

Assembly Fixing

Tamper resistant screws

Weight

2.0kg (4.4lbs)

Inputs

24V DC, 110V AC and 230V AC

Time Range

0.1 second to 40 minutes