HIMA VR-H4135 Safety Relay Module

The HIMA VR-H4135, also cataloged as the H4135 Safety Relay Module, operates as a dedicated hardware component for safe and fault-tolerant switching of signals within HIMax / HIMatrix safety systems platforms. Configured to monitor and control safety circuits, the module utilizes dual potential-free change-over relays to transition downstream loops into a predetermined state upon command. The device enforces physical separation between control-side logic inputs and field-side actuator circuits to manage emergency shutdown configurations.

Hardware Specifications

Galvanic Isolation and Fail-Safe State Execution

The internal architecture of the VR-H4135 is built around complete galvanic isolation between the 24 VDC logic drive inputs and the potential-free output relay contacts, adhering to EN 50178 standards for safe electrical separation. This physical barrier blocks voltage surges from crossing into the host logic platform. In the event of a total control signal loss or power failure, the internal spring-loaded mechanism executes a deterministic fail-safe state execution, driving the contacts open to interrupt the safety loop and de-energize the connected final control elements.

Frequently Asked Questions

Q: What are the inductive load constraints when switching heavy field actuators with the VR-H4135?

A: When switching inductive DC or AC loads, external spark suppression circuits or free-wheeling diodes must be wired in parallel with the load. Unsuppressed inductive counter-electromotive force (back-EMF) will accelerate contact erosion, diminishing the rated 250,000 electrical operations lifecycle.

Q: Is the internal overcurrent fuse on the output contacts field-replaceable?

A: Yes. The module contains an integrated 4 A time-lag replaceable fuse to protect the gold-plated AgNi contacts from overcurrent welding during short-circuit conditions. Power must be isolated from the module before accessing the fuse compartment.

Q: Can this module be hot-swapped within an active safety terminal base assembly?

A: The VR-H4135 itself can be inserted or removed from its DIN rail mounting base. However, removing the module will physically break the associated loops. Interlocking circuits must be bypassed or verified to be in a safe operational condition prior to physically extracting the module.

Field Installation Guidelines

• DIN Rail Attachment: Mount the module horizontally or vertically onto a standard 35 mm DIN rail or C rail. Engage the rear retention clip until an audible click confirms positive mechanical stability.
• Wire Sizes and Termination: Connect field wiring using conductors spanning 0.25 to 2.5 mm2 (AWG 14 maximum). Torque screw terminals appropriately to maintain low-resistance contact points under high vibration.
• Separation of Circuits: Maintain distinct physical separation between the 24 VDC input logic lines and the high-voltage AC output switching lines within the panel wire ducts to mitigate capacitive noise coupling.
• Conduit and Housing Fit: Secure all external junction enclosures housing the module. When integrating into hazardous zones, verify exactly 5 threads of engagement for all rigid NPT conduit entries to maintain the overall explosion protection envelope.