Product Overview
The Reno A&E B-3 is the 120 VAC 11-pin version of the Model B single-channel loop detector family. It is used with one inductive vehicle loop in gate operators, barrier arms, parking access equipment, and older access-control cabinets. The B-3 provides dual relay outputs and internal DIP switch configuration, allowing it to support common loop functions such as vehicle presence, pulse-on-entry, pulse-on-exit, safety, and hold-open signaling depending on how the controller is wired. Because B Series detectors are an older Reno platform, many service jobs now cross-reference them with BX Series detectors, especially BX-3 for 120 VAC applications. Still, a B-3 should not be replaced by model number similarity alone. Confirm line voltage, fail-safe or fail-secure behavior, 11-pin wiring, and relay use before installation.
Compatible With
- Older Reno A&E Model B installations calling for B-3, B3, or 120 VAC 11-pin Model B detector.
- Select gate operators, barrier gates, parking systems, and access-control panels using 120 VAC detector power.
- 11-pin Amphenol-style detector sockets or Reno 802-4 style harness wiring when the pinout is confirmed.
- Applications needing dual relay outputs for presence, pulse-on-entry, pulse-on-exit, and safety loop functions.
- Commonly associated with BX-3 as the later 120 VAC BX Series service direction, when the relay behavior and wiring match.
Features and Specifications
| Manufacturer | Reno A&E |
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| Product Type | Single channel dual output vehicle loop detector |
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| Part Number | B-3 / B3 |
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| Application | 120 VAC vehicle loop detection for gates, barriers, and parking controls |
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| Input Voltage | 120 VAC family |
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| Connector Style | 11-pin Amphenol-style rear connector |
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| Output Type | Dual relay outputs |
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| Setup | Internal DIP switches and front panel pushbutton style setup |
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| Related Service Direction | BX-3 is the related 120 VAC BX Series detector often used in newer service work |
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| Notes | Confirm fail-safe or fail-secure operation from original side label |
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Also Known As / Related Part Numbers
Technician Note
If replacing a B-3 with a BX-3, transfer only the intended function, not just the switch positions. The switch layouts and setup logic between older and newer detector families may differ.
Before Ordering Checklist
- Confirm the original detector is B-3, B3, or another verified 120 VAC Model B detector.
- Check whether the side label shows fail-safe or fail-secure configuration.
- Verify the cabinet supplies 120 VAC at the detector socket.
- Record all used relay wires before removing the old detector.
- Test loop continuity and insulation if the detector fail LED was active.
Important Ordering Warnings
- B-3, B-4, and B-8 are different voltage models.
- BX-3 is a related newer service option, but it is not automatically correct unless voltage, output, and wiring match.
Professional Advisory
Vehicle loop detectors and related wiring parts should be installed with the operator power off and tested with the gate, barrier, or door system in a controlled position. Do not bypass required safety devices. If the installation involves high voltage, damaged conduit, wet junction boxes, or uncertain relay wiring, use a qualified gate or access-control technician.
Product Questions and Answers
What voltage is the Reno B-3?
The B-3 is the 120 VAC version of the Reno A&E Model B 11-pin single-channel detector.
Is B-3 the same as B-4?
No. B-3 is the 120 VAC version, while B-4 is the low-voltage version.
Can BX-3 replace B-3?
BX-3 is commonly associated with newer 120 VAC replacement work, but the relay wiring, fail mode, and socket pinout should be verified.
What does dual output mean on this detector?
Dual relay outputs allow the detector to support different controller functions such as presence, pulse-on-entry, or pulse-on-exit when configured correctly.
Why does loop condition matter?
A cut loop wire, poor splice, water intrusion, or ground fault can cause fail indications even if the detector itself is good.
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