Hikvision 4-Output SPDT Relay Expansion Module with RS-485 Bus Extender for Intrusion Detection Systems
DS-PM501R4 - The module is a bus relay expander designed for professional intrusion detection systems, ideal for controlling external devices thanks to 4 high-capacity SPDT relay outputs (16A up to 250VAC) that guarantee maximum operational reliability. It integrates a half-duplex RS-485 bus with bus extender function , allowing communication to be extended over long distances and ensuring greater system stability. Powered directly by the bus and designed for indoor installation, it offers a compact, safe solution that can be easily integrated into advanced systems. Hikvision
DS-PM501R4 – EXPANSION MODULE

The Hikvision DS-PM501R4 expansion module is designed for professional intrusion detection systems, offering 4 high-capacity SPDT relay outputs up to 16A (24VDC/250VAC) for the reliable control of external devices and automations. Thanks to the half-duplex RS-485 bus with integrated bus extender function , it allows you to extend communication and improve system stability even over long distances. Powered directly by the bus and designed for indoor installation, it represents a compact, safe and high-performance solution for advanced integrations.
Main features:
- 4 high capacity SPDT relay outputs up to 16A for device control
- Half-duplex RS-485 bus with extender function for greater coverage
- Direct bus power supply for simplified installation
- Compatibility with Hikvision professional intrusion systems
- Wall installation for indoor environments
Further details
Technical data sheet
| DS-PM501R4 | |
| Outputs | |
| Max. outputs | 4 |
| On-board PGM outputs | 4 |
|
Bus interconnection |
|
| Bus extender | Yes |
| Bus technology | Half-Duplex RS-485 |
| Bus wiring | 4-Core Alarm Cable (at least 2 × 0.5 mm² + 2 × 0.22 mm²) |
| Power supply - general | |
| Input voltage | 12 VDC nominal (9~16 VDC), powered by bus |
| Quiescent current | 200 mA @12VDC |
| Max. current | 300 mA @12VDC |
| Relay output | |
| Relay output | SPDT relay, 16A 24VDC, 16A 250VAC |
| Environmental | |
| Operating temperature | -10°C to 50°C (14°F to 122°F), indoor use only |
| Storage temperature | -20°C to 60°C (-4°F to 140°F) |
| Relative humidity | 10% ~ 90% non-condensing |
| Physical | |
| Dimensions (W × H × D) | 110 × 155 × 31 mm |
| Weight | 272 g |
| Tamper-proof | Front and Rear |
| Installation method | Wall mount |
| Compliance | |
| Electrical compliance | CE, CB |
| EN 50131 | Security Grade 2, Environmental Class II |


