VR-H4116 Industrial-Grade 24VDC Relay Module (Terminal Block Design)

The VR-H4116 represents a field-proven relay solution engineered for process safety, machinery protection, and distributed control architectures. This 24-volt DC relay combines low coil power consumption with robust contact switching in a compact terminal housing format, enabling rapid installation on standard DIN rails without additional mounting hardware.

Designed for environments where signal isolation and fail-safe operation are non-negotiable, the VR-H4116 serves as the critical interface between low-power control logic and high-current field devices. Its potential-free changeover contact architecture ensures complete galvanic separation between input and output circuits, preventing ground loops and cross-contamination in multi-vendor automation ecosystems.

Whether you're expanding PLC digital outputs, multiplying safety trip paths, or interfacing proximitor sensors with alarm panels, the VR-H4116 delivers consistent performance across temperature extremes and demanding duty cycles. Factory-tested for contact integrity and insulation strength, each unit ships ready for immediate commissioning in SIL-capable safety instrumented systems.

Core Features & Benefits

✓ Ultra-Low Power Consumption
Draws only 20mA at 24VDC nominal voltage, minimizing heat generation and enabling dense panel layouts without thermal management concerns. Ideal for battery-backed UPS systems where every milliamp counts.

✓ Potential-Free SPDT Contact Configuration
Single-pole double-throw design with NO/NC terminals provides maximum flexibility for normally-open or normally-closed logic. 4kV isolation voltage ensures safe operation in mixed-voltage environments up to 250VAC.

✓ High-Speed Switching Response
Pickup time ≤15ms and dropout ≤10ms enable real-time response to critical process events. Suitable for high-frequency alarm annunciation and rapid interlock sequencing up to 300 cycles/hour.

→ Terminal Housing for Tool-Free Mounting
Integrated terminal block design eliminates separate socket requirements. Snap directly onto 35mm DIN rail, wire via screw terminals, and hot-swap in redundant configurations without disrupting adjacent circuits.

→ Wide Operating Temperature Range
-25°C to +70°C ambient rating supports outdoor enclosures, unheated control rooms, and tropical climates. Maintains contact reliability across seasonal temperature swings without derating.

→ Compliance-Ready for Global Markets
CE marked, RoHS compliant, and UL recognized component status accelerates certification for machinery exports. Meets IEC 61810 relay standards for industrial control applications.

Typical Application Scenarios

Turbomachinery Vibration Monitoring
Interface Bently Nevada 3300 XL proximitor outputs with SCADA alarm inputs. The VR-H4116 isolates 24VDC sensor logic from 120VAC annunciator circuits, preventing sensor damage from backfeed voltage while providing audible/visual alerts for bearing failures.

Emergency Shutdown (ESD) Logic Multiplication
Expand single safety PLC outputs into multiple redundant trip paths for valve actuators and pump motor starters. Potential-free contacts enable parallel wiring to geographically distributed shutdown devices without common-mode failure risks.

Multi-Vendor PLC Integration
Bridge incompatible I/O voltage levels between Allen-Bradley, Siemens, and HIMA controllers. Use VR-H4116 as a universal translator relay to drive 24VDC inputs from 48VDC outputs or vice versa, maintaining system modularity during phased upgrades.

Remote Indicator Panel Driving
Amplify low-current PLC outputs to switch LED tower lights, electromagnetic sounders, or rotating beacons located hundreds of meters from the control cabinet. 5A contact rating handles inrush currents from incandescent lamps and solenoid coils.

Interlock Circuit Isolation
Create safety barriers between hazardous area circuits (Zone 1/Div 1) and safe area control panels. The 4kV isolation voltage provides an additional layer of protection beyond intrinsic safety barriers, reducing certification complexity.

Technical Parameters & Selection Guide

Selection Criteria:
Choose the VR-H4116 when you need galvanic isolation between control and load circuits, require DIN rail mounting without separate sockets, or must interface 24VDC logic with higher-voltage field devices. For SIL-rated applications, pair with certified safety logic solvers and implement appropriate diagnostics. For loads exceeding 5A or requiring faster switching (<5ms), consider solid-state relay alternatives.

Extended Functions

IoT Integration Capability
When combined with HIMA HIMax or HIMatrix safety controllers, the VR-H4116 enables remote monitoring of relay status via Modbus TCP, PROFINET, or OPC UA protocols. Diagnostic data including coil voltage, contact position, and cycle count can be logged to cloud-based predictive maintenance platforms for early failure detection.

Redundant Configuration Support
Deploy in 1oo2 (one-out-of-two) or 2oo3 (two-out-of-three) voting architectures for high-availability applications. Terminal housing design allows hot-swapping of failed relays without de-energizing adjacent circuits, minimizing downtime during maintenance windows.

Customization Options
Factory modifications available for special coil voltages (12VDC, 48VDC, 110VDC), gold-plated contacts for low-level signal switching, or conformal coating for harsh chemical environments. Consult factory for lead times and minimum order quantities.

Delivery & Service Assurance

Lead Time:
→ Standard units: 3-5 business days (in-stock items)
→ Custom configurations: 4-6 weeks (subject to factory scheduling)

Warranty Coverage:
12-month manufacturer warranty against defects in materials and workmanship. Warranty excludes damage from overvoltage, mechanical abuse, or operation outside published specifications.

Technical Support:
Access to application engineers for wiring diagrams, load compatibility analysis, and troubleshooting assistance. Email support responds within 24 hours; phone support available during business hours (GMT+8).

Documentation Package:
Each relay ships with factory test certificate, dimensional drawings, terminal wiring diagram, and recommended snubber circuits for inductive loads. CAD models (STEP/IGES) available on request for panel layout design.

Frequently Asked Questions

What surge protection is recommended for inductive DC loads?
Install a flyback diode (1N4007 or equivalent) across the load terminals with cathode toward positive supply. This suppresses back-EMF spikes that can weld contacts or induce noise into adjacent circuits.

How does contact life vary with switching frequency?
At 300 operations/hour (maximum rated duty), expect approximately 100,000 cycles at full 5A resistive load. Reducing load to 50% (2.5A) can extend life to 200,000+ cycles. Inductive loads may reduce life by 30-50% depending on power factor.

Can multiple VR-H4116 relays share a common 24VDC supply?
Yes, but ensure supply capacity accounts for inrush current during simultaneous energization. Each relay draws 20mA steady-state; size power supply with 20% margin for voltage drop and ripple tolerance.

Is the relay suitable for safety-critical applications?
The VR-H4116 is a standard industrial component, not a certified safety relay. For SIL 2/3 functions, integrate within a certified safety logic solver (e.g., HIMA HIMax) with appropriate diagnostics, redundancy, and proof-test intervals per IEC 61508.

What is the maximum wire gauge for terminal connections?
Terminal blocks accept 14-22 AWG (0.5-2.5mm²) solid or stranded wire. Use ferrules for stranded wire to prevent strand breakage. Tighten terminal screws to 0.5-0.6 Nm torque.

Does the relay require external RC snubbers for AC loads?
For AC inductive loads (contactors, solenoids), install a 0.1µF/250VAC capacitor in series with a 100Ω/2W resistor across the load to suppress arcing and extend contact life. Snubbers are not required for resistive loads.

Ready to Optimize Your Control System?

Contact our technical sales team for application-specific recommendations, volume pricing, or expedited delivery options. We support global shipping with DHL/FedEx express service and provide customs documentation for duty-free import under HS code 8536.41.

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