Autronica 116-BN-310: Single Relay Output Unit — SelfVerify, Specifications and Applications

What Is the Autronica 116-BN-310 Single Relay Output Unit?

The 116-BN-310 is an interface (I/O) unit within Autronica’s I/O product line, built for the AutroSafe and Autroprime interactive fire detection platforms. Instead of detecting fire itself, it converts a digital alarm command from the fire alarm control panel into a physical relay action — a single potential-free changeover contact that can switch an external circuit such as a magnetic door holder, a sprinkler valve solenoid, or a fire damper actuator.

Because the 116-BN-310 is an addressable loop device, it occupies one address on the detection loop and can be configured so its contact is activated by any detector, or logical combination of detectors, anywhere in the system — it is not restricted to devices wired on the same physical loop segment. This gives system designers flexibility to build cause-and-effect (C&E) logic across zones without adding extra field wiring.

How Does the SelfVerify Function Work on the Autronica 116-BN-310?

SelfVerify is Autronica’s automatic self-testing technology: every SelfVerify-equipped unit, including the Autronica 116-BN-310, verifies its own ability to activate once every 24 hours without manual intervention. This is the same reliability principle used across Autronica’s interactive detector and call point range, applied here to an output device.

For engineering teams and facility operators, this delivers three practical benefits:

1. Lower maintenance overhead: routine functional checks of each relay output are performed automatically by the system, reducing the number of units technicians must test by hand during scheduled maintenance rounds.
2. Documented compliance: the control panel logs each self-test cycle, giving an auditable record that every relay output on the loop is functional — useful evidence during classification surveys and fire authority inspections.
3. Faster fault detection: a unit that fails its self-test is reported immediately to the panel, instead of remaining silently non-functional until the next scheduled manual test.

Key Features of the Autronica 116-BN-310

• Interactive, addressable loop device with automatic addressing — no manual configuration
• One potential-free changeover (SPDT) contact, rated 1 A at 30 VDC resistive
• SelfVerify function — automatic self-test every 24 hours
• Built-in short-circuit isolator in every unit
• Activatable from any detector in the system, regardless of physical loop
• Proven technology, designed to meet the requirements of the major maritime classification societies
• Compliant with EN 54-5/EN 54-7 environmental requirements

The short-circuit isolator built into every 116-BN-310 matters at the system level: on a loop architecture, a single cable fault could otherwise disable every device downstream. Because isolation happens at the device, a fault is contained between two adjacent units, and the rest of the loop — including other relay outputs controlling dampers or sprinklers elsewhere in the facility — keeps operating. That containment is a key design consideration for high-consequence sites such as offshore platforms, LNG terminals and data centers.

Autronica 116-BN-310 Technical Specifications

Source: Autronica Fire and Security AS, Autronica 116-BN-310 Product Datasheet (Doc-1000376-2, 2026).

Wiring and Connections of the Autronica 116-BN-310

The 116-BN-310 connects in-line on the detection loop through four active loop terminals: Pos (+) in, Pos (+) out, Neg (−) in and Neg (−) out. The relay contact itself is wired separately through three terminals: Normally Open, Normally Closed and Common, giving installers the choice of a fail-open or fail-closed configuration depending on the controlled circuit (door holder, damper actuator or sprinkler valve solenoid). Four additional terminals on the unit are marked “N.A.” (not for use).

Because the short-circuit isolator sits inside the unit itself, loop segmentation happens automatically around any cable fault — a relevant factor when calculating loop load and planning cause-and-effect wiring across several 116-BN-310 units on the same circuit. External controlled devices cannot be powered directly from the detector loop and require their own power supply.

Where the Autronica 116-BN-310 Is Applied

As an output unit within the AutroSafe and Autroprime interactive platforms, the 116-BN-310 is specified wherever a fire alarm event needs to trigger a physical action rather than only an audible/visual alarm:

• Door release: holding fire doors open under normal conditions and releasing them on alarm to restore compartmentation.
• Sprinkler control/functions: interfacing detection logic with sprinkler valve actuation circuits.
• Fire damper control: closing HVAC dampers to prevent smoke spread through ductwork.
• Oil & gas, offshore and petrochemical facilities: integrated into AutroSafe/Autroprime cause-and-effect matrices across process areas, accommodation modules and technical buildings — a growing requirement across the European oil & gas market.
• Maritime and offshore installations: designed to meet the requirements of the major classification societies, supported by an IP66-rated enclosure for harsher shipboard environments.
• Data centers: relay-controlled damper and door interfaces as part of a broader fire protection strategy — see our guide to fire protection for data centers.

Related I/O Units in the Autronica Range

The 116-BN-310 sits within a broader family of interface units used to build cause-and-effect logic on the detection loop:

Selecting between these depends on the number of outputs required per address and the specific interface logic needed — our engineering team can help map the correct combination to your cause-and-effect matrix.

Frequently Asked Questions About the Autronica 116-BN-310