Description
Product Introduction
The MRC P58056A P/A Relay PCB is a relay printed circuit board identified for use with the MRC MPA-5400A marine public address and general alarm (PA/GA) system. The board is intended for system-specific relay control and switching functions within a compatible installation.
The P/A designation is described in the supplied product title as Pump / Auxiliary. However, the precise relay functions, supported circuits, and switching ratings should be confirmed against the original board markings and equipment documentation before installation.
This PCB is suitable for maintenance, repair, and spare-parts sourcing when the existing MPA-5400A system specifies the P58056A assembly. Matching the part number and revision is essential to maintaining correct system operation.
P58056A
Key Features
- Manufacturer: MRC
- Model: P58056A
- Product Type: P/A Relay Printed Circuit Board
- Associated System: MPA-5400A
- Application: Marine communication and control equipment
- Primary Function: Relay switching and control within the specified system
- Installation Type: PCB-level replacement
- Maintenance Use: Repair, servicing, and spare-parts inventory
Product Datasheet
| Parameter | Description |
|---|---|
| Brand | MRC |
| Model | P58056A |
| Series | MPA-5400A |
| Product Name | P/A (Pump / Auxiliary) Relay PCB |
| Place of Manufacture / Origin | Not independently verified |
| Product Status | Existing equipment; verify actual condition with the seller |
| Dimensions | Not verified |
| Weight | Not verified |
| Country of Origin | Not independently verified |
| Power Requirements | Confirm from the PCB markings and system documentation |
| Discontinued | Not verified |
Installation and Compatibility Notes
- Verify the complete part number, P58056A, and confirm that the existing equipment uses the MPA-5400A system.
- Compare the PCB revision, relay arrangement, connectors, and terminal markings with the original board.
- Confirm the intended Pump / Auxiliary switching function and the electrical ratings of the connected circuits.
- Isolate relevant power sources before removing or installing the PCB, and follow appropriate electrical safety procedures.
- Use the correct wiring diagrams to reconnect the board and verify its operation after installation.
- Do not substitute another MPA-5400A relay or control PCB without confirming its function and compatibility.
Frequently Asked Questions
Q1: What is the MRC P58056A?
A: It is a P/A Relay PCB identified for the MRC MPA-5400A system.
Q2: What does P/A mean?
A: The supplied product title expands P/A as Pump / Auxiliary. Confirm the board’s exact switching functions from the original equipment documentation.
Q3: What is the board used for?
A: It is intended for relay-related switching or control within a compatible MPA-5400A installation. The exact circuits and relay ratings have not been verified.
Q4: Can it replace another MRC relay board?
A: Not automatically. Different boards may have different relay assignments, electrical ratings, and connector layouts. Match the full part number before ordering.
Q5: What are the operating voltage and relay ratings?
A: These specifications have not been verified. Consult the PCB markings and MPA-5400A technical documentation before connecting the board.
Q6: What should be checked before purchasing?
A: Confirm the model number, revision, physical condition, relay markings, connectors, and compatibility with the existing system.
Recommended Related MRC Models and Components
The following MRC products are associated with marine communication equipment or the MPA-5400A system. They may be useful for maintenance sourcing but are not confirmed direct replacements for the P58056A.
- MRC P58036C — Main Control PCB for MPA-5400A.
- MRC P53014 — Speaker Control Unit PCB for MPA-5400A.
- MRC P48005 — Call Signal Oscillator PCB for MPA-5400A.
- MRC P47011B — R/T Control Board for MPA-5400A.
- MRC P53019 — Microphone Control Relay for MPA-5400A.
- MRC P58098A — Power Amplifier Junction Board for MPA-5400A.
- MRC P53035 — Printed Circuit Board for MPA-5400A.
- MRC P53013 — Main Control Unit / Main Control Circuit Board.
- MRC P48027 — Power Relay PCB.
- MRC PM-271 — Microphone Control Unit.
- MRC MPA-5400A — Marine public address and general alarm system.
- MRC MPA-5400A Power Unit — Power equipment for the system; confirm the exact part number.
- MRC MPA-5400A Power Switch Unit — Power switching equipment for the associated installation.
- MRC MPA-5400A Cassette & Radio Unit — Audio source equipment for the system.
- MRC MPA-5400A Terminal Board — Wiring interface component; verify the required model.
Purchasing Reminder
Before ordering, confirm the exact identification MRC P58056A P/A Relay PCB for MPA-5400A. Check the physical board markings, revision, relay specifications, connector layout, and condition. Verify the intended Pump / Auxiliary function and electrical compatibility before installation.
