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Rectangular circuit board with green finish, multiple connectors and relay modules visible

MERCURY

Mercury MR52-S3 Dual Reader Interface Panel Module handheld pcs accessory

SKU CH-RNJN-DH4VF MPN MR52-S3

A dual-reader interface panel module with eight programmable inputs and six Form-C relay outputs for access control systems

  • Supports two reader ports for dual-door access control
  • Operates on 12 to 24 VDC with 550 mA maximum draw
  • Communicates via RS-485 twisted pair up to 4000 feet
  • Functions reliably from 0 to 70 °C ambient temperature
  • Provides six Form-C relays rated at 5 A / 3 A @ 30 VDC

Dual Reader Interface Panel

The Mercury MR52-S3 is an interface panel module designed for access control systems that require two reader ports. It supports up to two doors per controller and provides eight general-purpose inputs alongside two dedicated inputs for tamper and power monitoring. Installers and system integrators use it to expand door control in commercial security installations.

Capacity and Headroom

Six Form-C output relays handle switching loads with normally open contacts rated at 5A @ 30 VDC and normally closed contacts at 3A @ 30 VDC. Host communication runs over RS–485 two-wire twisted pair shielded cable up to 4,000 feet using Belden 9841 or equivalent. The unit draws a maximum of 550mA from a 12-24 VDC supply with ten percent tolerance. It does not suit applications needing more than two reader ports or relay counts beyond six.

Thermals, Noise and Power

Operating temperature range spans 0 to 70 degrees Celsius (32 to 158 Fahrenheit) with storage tolerance from -55 to 85 degrees Celsius. Humidity tolerance is 5 to 95 percent RH non-condensing. Primary power accepts 12 to 24 VDC at up to 550mA. The module has no moving parts, so it generates no audible noise during normal operation.

Highlights

  • Supports two reader ports for dual-door access control
  • Operates on 12 to 24 VDC with 550 mA maximum draw
  • Communicates via RS-485 twisted pair up to 4000 feet
  • Functions reliably from 0 to 70 °C ambient temperature
  • Provides six Form-C relays rated at 5 A / 3 A @ 30 VDC

Specifications

No published specifications for this item yet.

Questions about this item

Will the MR52-S3's RS-485 host link at 4,000 feet reach the door controllers I already have wired with Belden 9841?

Yes — the panel communicates over 2-wire RS-485 up to 4,000 feet on twisted-pair shielded cable such as Belden 9841, matching your existing wiring.

Which LEDs or relay clicks confirm the MR52-S3 is powered and talking to the host after I apply 12-24 VDC?

Apply 12-24 VDC (550 mA max); the dedicated power-monitor input and tamper input will report status, and the six Form-C relays (NO 5 A / NC 3 A @ 30 VDC) will click on command.

Does the MR52-S3 ship with the Belden 9841 cable and 12-24 VDC supply, or must I source them separately?

The module provides two reader ports, eight programmable inputs, two dedicated inputs and six Form-C relay outputs; cable and power supply are not included.

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