Our 440T Electronic Timed-delay Unit Trapped Key Interlock Switches are used in applications that require an elapsed time to occur before allowing access to a hazardous area. This interlock switch uses a Guardmaster® SI safety relay in combination with a Guardmaster EMD safety relay to execute the timing sequence. Turning a non-removable key initiates the timer. When the EMD times out, its output energizes an internal solenoid which then allows the removal of either one or two trapped keys.
- Timed-delay output up to 40 minutes
- Single-key or dual-key
- 316L stainless steel keys
- Category 1 stop
- Replaceable code barrel assembly
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- CE Marked for all applicable directives
- TÜV Certified
Functional Safety Data
- PFHd = 1.00E-7 (Probability of dangerous failure per hr)
- T1 = 20 (Proof test interval)
Standards Safety Classification
EN ISO 14119 and GS-ET-31 and can be used in safety application up to Category 3, PLd in accordance with EN ISO 13489-1, and in the application area of EN 60204-1.
Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details.