Description
1. At-A-Glance Executive Brief
- Model: VR-H 4135
- Brand: HIMA
- Part Type: Safety Relay Amplifier / Coupling Relay Module
- Lifecycle Status: Mature / Discontinued
- System Compatibility: HIMA Safety Instrumented Systems and PES Control Loops
- Core Protocol: Hardwired Safety Relay Interface
2. Technical Introduction
- Problem-Agitation-Solution: Forcing high-current or inductive final control elements to trip reliably from low-power controller outputs often strains standard interface components, risking contact welding or failure under emergency conditions. The HIMA VR-H 4135 is a heavy-duty safety relay amplifier designed to bridge safety logic controllers with critical field actuators under strict SIL 3 requirements. By providing robust galvanic isolation and redundant switching contacts, the unit safely amplifies output commands while preventing fault feedback loops from reaching sensitive processor cards.
Engineer’s Takeaway: Deploying the VR-H 4135 ensures dependable signal isolation and high-capacity contact switching for your safety instrumented loops, protecting final elements without altering system wiring schemes.
3. Core Technical Specifications
| Parameter | Value |
| Manufacturer | HIMA |
| Product Family | Safety Relays / Interface Modules |
| Module Type | Safety Relay Amplifier / Coupling Relay |
| Safety Integrity Level | SIL 3 compliant architecture |
| Mounting Type | Standard DIN rail or panel terminal housing |
| Operating Temperature | -10°C to +55°C |
| Module Weight | Approx. 0.5 kg |
4. Field Engineer’s Tech Notes
- Inductive Load Quenching and Contact Wear: When driving heavy inductive loads like solenoid valves or large contactors through the VR-H 4135, always verify that external flyback diodes or RC snubber networks are installed across the load terminals. Unsuppressed inductive kickback will rapidly pit and weld the internal relay contacts, leading to dangerous failure-to-release states during safety trips.
- DIN Rail Grounding and Enclosure Parasitic Coupling: Ensure the module chassis and mounting rail maintain a low-impedance connection to the main cabinet protective earth. Poor grounding inside high-voltage marshalling cabinets can introduce electromagnetic coupling across the relay coil circuits, causing intermittent chattering or false state detection.
5. Adaptive QA & Testing Protocol
Before dispatch, this VR-H 4135 unit undergoes bench validation on an electrical test rig. Technicians verify coil pickup and dropout voltage thresholds, measure contact resistance under rated load, and test insulation resistance for galvanic isolation integrity. Mechanical response times and contact synchronization are checked to ensure proper switching performance. Complete test logs and verification recordings are available upon request prior to shipment.
6. Buyer’s FAQ
- What warranty is provided for this hardware?All New Surplus and fully tested refurbished HIMA safety modules include a standard 12-month operational warranty from the date of purchase.
- Is this part supplied as New Surplus or Refurbished?Stock availability alternates between factory-sealed New Surplus (NSFP) and fully bench-tested refurbished inventory. Contact our sales department to verify current stock condition.
- What is the typical shipping lead time for urgent requirements?
