VR-H 4116 HIMA Fail-Safe Safety Relay in Terminal Housing

Functional Engineering Overview

The VR-H 4116 is a high-reliability safety relay integrated into a compact terminal housing, engineered for critical switching applications within HIMA safety-related systems. This module features a single fail-safe changeover contact designed to maintain circuit integrity under rigorous industrial conditions. Utilizing hard gold-plated AgNi (Silver-Nickel) contacts, the VR-H 4116 ensures exceptional conductivity for both low-level signals and higher power loads, providing a versatile interface between safety logic and field actuators.

Detailed Technical Specifications

• Model Identification: VR-H 4116

• Contact Architecture: 1 Fail-safe changeover contact (SPDT), sealed

• Nominal Input Voltage: 24 VDC (Range: 20.4 V to 28.8 V)

• Typical Current Draw: 20 mA

• Switching Performance: Activation time ~7 ms; Reset time ~5 ms

• Contact Material: AgNi with hard gold-plating for low-contact resistance

• Short-Circuit Protection: Integrated $\le$ 4 A time-lag fuse

• Housing Protection: IP20 rated terminal enclosure

• Thermal Management: Power dissipation between 1 W and 2 W

• Ambient Operating Range: -25°C to +50°C

• Wiring Interface: 0.25 to 2.5 mm² (AWG 24-14) via screw terminals

• Mounting Compatibility: Standard 35 mm DIN rail or C-profile rail

Installation and Reliability Standards

The VR-H4 116 is designed for high-density mounting with no mandatory clearance required between adjacent units, maximizing cabinet space efficiency. The hard gold-plated contacts are specifically advantageous in "dry circuit" applications where low voltages (starting at 1mV) must be switched without oxide layer interference. For high-demand safety loops, the integrated 4A time-lag fuse serves as a critical safeguard against field-side overcurrent, protecting the relay’s internal switching structure.

Technical FAQ

What is the benefit of gold-plated contacts in the H4116?

The gold plating prevents oxidation, ensuring the relay can reliably switch very low currents ($\ge$ 1 mA) even after long periods of inactivity, which is common in emergency standby systems.

Can this relay be mounted in any orientation?

Yes, the H4116 supports both horizontal and vertical mounting on standard DIN rails without affecting its switching dynamics or the 1 ms bounce time specification.