Nittan EV-3IO Loop-Powered Addressable IO Module, 3 Inputs, 3 Outputs F16-82265

Introduction to the Nittan EV-3IO Loop-Powered IO Module

Product overview:The Nittan EV-3IO (F16-82265) is a loop-powered analogue addressable input/output (IO) interface module designed for Nittan Evolution addressable fire systems. Compact and feature-rich, the EV-3IO offers three Class-B monitored inputs, three relay outputs (one mains-rated 5 A relay and two low-voltage 1 A relays), and an integral negative (-ve) line short-circuit isolator that is self-resetting. It supports EEPROM handheld addressing, provides status LEDs and remote LED outputs, and includes a failsafe option suitable for door-release control.

Why it matters:For system designers and installers working with addressable fire panels, a reliable, certified IO module like the EV-3IO simplifies wiring, expands interfacing options with third-party devices, and helps maintain loop integrity in the event of wiring faults. The loop-powered architecture also reduces installation complexity by removing the need for a separate power supply for the module itself.

Detailed specifications and benefits

The EV-3IO is engineered to meet demanding fire system needs while remaining easy to integrate. Below is a compact summary of the technical specifications and the real-world benefits they deliver.

• Part number:EV-3IO (F16-82265)
• Operating voltage:20–38 V dc (loop powered)
• Quiescent current:860 µA
• Alarm current:8.3 mA
• Isolator current (short):approximately 15 mA
• Inputs:3 × Class-B monitored inputs
• Outputs:1 × 5 A relay @ 240 Vac; 2 × 1 A relays @ 30 V dc
• Isolator style:Negative (-ve) line isolator (self-resetting)
• Addressing:EEPROM handheld addressing
• LED indicators:Input/output, fault and isolator open; remote LED outputs
• Failsafe option:Yes — suitable for door release control
• Standards:EN54-17 (line isolators) and EN54-18 (input/output devices)

• Loop-powered operation:Because the EV-3IO draws power directly from the detection loop (20–38 V dc), there is no need for a separate local power supply. This simplifies wiring, reduces component count, and lowers installation costs and maintenance points.
• Integral short-circuit isolator:The negative-line isolator keeps the rest of the loop operational if a short occurs. The self-resetting design restores normal operation once the fault is cleared, helping to maximise system availability and reduce false or prolonged outages.
• Versatile relay set:The combination of a mains-rated 5 A relay and two low-voltage 1 A relays allows the module to directly control a broader range of devices — from door-release solenoids and fans to signalling circuits and relays on third-party equipment.
• Certified performance:Compliance with EN54-17 and EN54-18 assures designers and clients that the EV-3IO meets recognised European standards for loop isolation and input/output device functionality, a key requirement for many commercial and public-sector installations.
• Installer-friendly features:EEPROM handheld addressing, local and remote LEDs, and clear wiring guidance make installation and commissioning straightforward for trained fire-alarm engineers.

Use cases and scenarios where the EV-3IO excels

The EV-3IO is well suited to a variety of practical applications in commercial, public, and industrial buildings. Typical use cases include:

• Door-release control:With a failsafe option and a mains-capable relay, the EV-3IO can be used to control electromagnetic door releases for secure doors, automatically releasing on alarm or maintaining fail-safe behaviour where needed.
• Detector circuit interface:The three Class-B monitored inputs can interface to local detector circuits, manual call points or other supervised devices, allowing the fire panel to monitor remote zones or third-party equipment reliably.
• Control of external equipment:The 5 A mains relay suits small motors, alarms, sounders or isolated mains circuits, while the two low-voltage relays are suitable for signalling to other control systems or triggering low-power devices.
• Fault-tolerant loop installations:The self-resetting negative isolator helps ensure that a single wiring fault does not disable the entire loop, making the module ideal for critical installations where maintaining detection coverage is essential.
• Integration with third-party systems:Building management systems, access control, HVAC and bespoke control logic often require monitored inputs and switchable outputs. The EV-3IO provides a compact, certified interface for such integrations.

Comparison with similar products on the market

Addressable IO modules are common in modern fire system architectures, but not all modules are the same. When comparing the EV-3IO to other modules, consider these differentiators:

• Loop-powered vs. externally powered:Some IO modules require a separate local power source. The EV-3IO’s loop-powered design reduces wiring complexity compared with externally powered modules, making it preferable for retrofit and clean installations.
• Isolator type:The EV-3IO uses a negative-line self-resetting isolator. Some competing modules may use positive-line isolators or non-resetting designs. The self-resetting feature reduces the need for manual reset following a cleared fault.
• Relay capacity and mix:The combination of a mains-rated 5 A relay plus two low-voltage relays gives flexible control options. Competing modules might offer only low-voltage relays or smaller contact ratings, requiring additional interface hardware for mains control.
• Certification:EN54-17/18 approvals are important for many projects. While several manufacturers provide certified modules, checking the exact standards and local certification (e.g., UKCA/CE where relevant) is essential. The EV-3IO’s compliance with EN54-17 and EN54-18 is a strong advantage for European-spec projects.
• Addressing and diagnostics:EEPROM handheld addressing and clear LED indicators make commissioning the EV-3IO straightforward. Some alternatives provide networked addressing tools or panel-based addressing only — the handheld option can speed up multi-module installations in the field.

In short, compared to many alternatives, the EV-3IO strikes a practical balance between loop-powered convenience, built-in isolation, certified compliance and relay flexibility — all of which reduce the need for ancillary components and simplify system design.

Customer feedback and installer perspectives

While individual reviews vary by project and installer preference, common positive themes reported by system integrators and fire-alarm engineers include:

• Ease of installation:Installers appreciate the loop-powered design because it reduces cable runs and eliminates an extra local power supply to route and maintain.
• Reliability under fault conditions:The self-resetting isolator is frequently cited as a valuable feature that keeps detection loops live and avoids full-loop outages caused by wiring faults.
• Versatility:The mixed relay outputs are often highlighted as saving time and hardware when interfacing to door releases, fans, or other mains-powered devices.

If you require formal testimonials or site-specific references, consult with suppliers, distribution partners or case studies provided by Nittan and authorised resellers. These sources can provide documented installations and user feedback relevant to your sector.

Conclusion: Why the Nittan EV-3IO is a great choice

The Nittan EV-3IO loop-powered addressable IO module offers a compelling combination of certified performance, practical installer-friendly features and versatile control options. Its loop-powered architecture simplifies wiring and reduces installation costs, while the integral negative-line self-resetting isolator enhances system resilience. The mix of one mains-rated 5 A relay and two low-voltage relays covers a wide range of interface needs without extra hardware, and EN54-17/18 approvals make it suitable for many commercial projects requiring recognised standards compliance.

For system designers, integrators and facilities managers looking for a compact, reliable and standards-compliant IO module for Evolution addressable panels, the EV-3IO stands out as a flexible, cost-effective option. With a suggested price of approximately {165.45} (supplier pricing may vary) and proven operational benefits, it is well worth considering for new installations and upgrades where dependable monitored inputs, robust relays and loop integrity are priorities.

Note on installation:The EV-3IO is intended to be installed and commissioned by trained and qualified fire alarm engineers in accordance with local codes and standards (for example, BS 5839 in the UK where applicable). Always refer to the manufacturer datasheet and product manual for detailed wiring diagrams, addressing procedures and limiting conditions before installation.