Vertiv Liebert SN-2D Two-Door Switch Monitor Sensor with Contact Inputs
The Vertiv Liebert SN-2D is a modular door switch monitor sensor designed for rack security and environmental monitoring in data centres, server rooms, and network closets. Featuring two dry contact inputs and modular connectivity with two connection points, the SN-2D allows for flexible custom string designs and daisy-chain configurations to monitor multiple doors or access points from a single monitoring device. This non-powered sensor integrates seamlessly with Vertiv MPX and MPH rack PDUs, Liebert RPC cards, and the IS-UNITY-DP communications card, delivering reliable door status monitoring and alarm notifications to protect critical equipment.
Key Features
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Two Dry Contact Inputs: Monitor up to two doors or access points with a single sensor probe
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Modular Design: Features two RJ45-style connection ports for daisy-chaining multiple sensors up to 65.6 ft maximum string length
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Non-Powered Operation: Door-switch contact rated for a minimum of 5V, 1mA with no external power required
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Wide Compatibility: Works with Vertiv Liebert MPX and MPH rack PDUs, RPC cards, RDU101, and IS-UNITY-DP communications cards
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Easy Installation: Includes all mounting hardware, cables, and quick-start guide for straightforward rack mounting
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Compact Construction: Lightweight design at just 0.11 kg fits easily within any rack environment
Enhanced Rack Security and Monitoring
The Liebert SN-2D sensor is purpose-built to assist in monitoring physical security and door status within server racks and IT enclosures. It can be placed in any area to read door open/closed status and trigger real-time alarm notifications when doors are opened or conditions exceed configured thresholds. This proactive monitoring capability helps protect critical equipment from unauthorised access and environmental risks.
Flexible Modular Configuration
With its modular sensor design, the SN-2D allows IT administrators to configure monitoring strings tailored to their specific needs. The sensor features separate cables and probes with two connection points, enabling multiple SN series sensors to be connected in series for comprehensive rack monitoring. Whether you need to monitor door switches, temperature, humidity, or leak detection, the SN-2D integrates into a scalable Liebert SN sensor ecosystem.
Seamless Integration with Vertiv Infrastructure
The SN-2D connects directly to Vertiv Liebert RPC monitoring cards, enabling monitoring through Vertiv MPX or MPH intelligent rack PDU models. It also works with the IS-UNITY-DP communications card for broader system integration and centralized management. Up to ten Liebert SN sensor probes may be connected to an RDU101 monitoring device, with integrated and modular sensors used in combination for complete visibility.
Reliable Performance for Mission-Critical Environments
Designed for data centres, telecommunications, healthcare, and enterprise IT environments, the SN-2D delivers dependable performance in demanding conditions. Its compact dimensions and lightweight construction make it ideal for tight rack spaces, while its robust design ensures long-term reliability. The sensor is backed by a one-year limited warranty against defects in material and workmanship.
What's in the Box
- Vertiv Liebert SN-2D Door Switch Monitor Sensor (1 probe with 2 contact inputs)
- Sensor Bracket - Base
- Sensor Bracket - Support
- RJ45 to RJ45 Cable (6.6 ft / 2 m)
- Screws (2 × 8-32 × 7/16")
- Dual Lock Fastener (0.5 ft)
- Cable Ties (2)
- Alcohol Pad
- Fastener (1/4 Turn High Profile)
- Quick-Start Installation Guide
Full Specifications
| Product Type |
Rack Door Contact Sensor / Door Switch Monitor |
| Model Number |
SN-2D |
| Number of Contact Inputs |
2 dry contact inputs |
| Number of Probes |
1 sensor probe |
| Connection Points |
2 RJ45-style ports (input and output for daisy-chaining) |
| Contact Rating |
Non-powered door-switch contact, minimum 5V, 1mA |
| Cable Length |
6.6 ft (2 m) RJ45 to RJ45 cable included |
| Maximum String Length |
65.6 ft (20 m) when multiple sensors daisy-chained |
| Dimensions (W × D × H) |
2 × 3/4 × 1-5/8 in (51 × 19 × 41 mm) |
| Net Weight |
0.25 lb (0.11 kg) |
| Shipping Weight |
0.44 lb (0.2 kg) |
| Compatibility |
Vertiv Liebert MPX/MPH rack PDUs, RPC cards, RDU101, IS-UNITY-DP communications card |
| Door Switch Compatibility |
Works with Vertiv AD-2D-DCM door switch kit or generic door switches |
| Mounting |
Rack-mountable with included brackets and hardware |
| Power Requirement |
Non-powered (passive sensor) |
| Warranty |
One Year Limited Warranty Against Defects in Material and Workmanship |
| Intended Use |
Rack security monitoring, door status detection, physical access monitoring |
| Typical Applications |
Data centres, server rooms, network closets, telecommunications facilities |
Specifications are sourced from the manufacturer product page and may be updated.
