Phoenix Contact PSR-SCP-24DC/ESP4/2X1/1X2 – 4-Channel Emergency Stop Safety Relay | PSR-SCP Series
Engineering Background: The PSR-SCP-24DC/ESP4/2X1/1X2 is a dedicated safety relay module engineered by Phoenix Contact for machine safety applications requiring IEC 62061 / ISO 13849-1 compliance. Designed for integration into safety-critical control architectures, it provides reliable monitoring of emergency stop circuits, safety gates, and two-hand control devices in industrial automation environments.
Product Positioning: Part of the PSR-SCP (Safety Control Products – Compact) series, this module targets OEM machine builders, system integrators, and plant engineers who require a compact, certified safety relay with dual-channel input monitoring and instantaneous output switching. It is a direct-fit replacement and upgrade path for legacy safety relay installations across manufacturing, packaging, and process industries.
Complete Technical Specifications
- Part Number: 2981020
- Model: PSR-SCP-24DC/ESP4/2X1/1X2
- Manufacturer: Phoenix Contact
- Series: PSR-SCP (Safety Control Products – Compact)
- Supply Voltage: 24 V DC (±20%)
- Input Channels: 4-channel emergency stop (ESP4)
- Output Contacts: 2 × N/O (normally open) + 1 × N/C (normally closed)
- Output Configuration: 2X1 / 1X2
- Safety Category: Category 4 / PLe (ISO 13849-1), SIL 3 (IEC 62061)
- Response Time: ≤ 20 ms
- Switching Voltage (max): 250 V AC / 24 V DC
- Switching Current (max): 6 A
- Rated Insulation Voltage: 300 V
- Mounting: DIN rail (35 mm)
- Housing Width: 22.5 mm
- Operating Temperature: -25 °C to +55 °C
- Protection Class: IP40 (front panel)
- Certifications: CE, UL, cUL, TÜV, BG
- Country of Origin: Germany
- Weight: approx. 167 g
Proven Application Environments
- Emergency stop (E-stop) circuit monitoring on industrial machinery
- Safety gate / interlocked guard door monitoring
- Two-hand control device safety circuits
- Light curtain and safety mat interface
- Robotic cell perimeter guarding
- Packaging and food processing lines requiring SIL 3 / PLe compliance
- Press and stamping machine safety control panels
- Conveyor and material handling safety systems
Engineering Advantages
- Dual-channel redundancy: 4-channel ESP input ensures cross-fault detection and eliminates single-point failure risk.
- Compact 22.5 mm footprint: Maximizes panel density without sacrificing safety performance.
- Instantaneous output switching: ≤ 20 ms response time meets the most demanding machine stop-time budgets.
- Wide supply voltage tolerance: ±20% tolerance on 24 V DC accommodates real-world power supply fluctuations.
- Multi-certification: CE, UL, cUL, TÜV, and BG approvals simplify global machine compliance documentation.
- DIN rail mounting: Tool-free snap-on installation reduces panel assembly time.
- LED status indication: Onboard diagnostics for power, input, and output states accelerate fault diagnosis.
System Architecture & Signal Flow
The PSR-SCP-24DC/ESP4/2X1/1X2 operates on a dual-channel monitored input architecture. The 4-channel emergency stop inputs (A1/A2, S11/S12, S21/S22, S31/S32) are continuously cross-monitored by the internal safety logic. Upon detection of an open circuit, short circuit, or cross-fault condition, the module de-energizes the 2 × N/O output contacts within ≤ 20 ms, simultaneously closing the 1 × N/C feedback/monitoring contact. Manual or automatic reset is selectable via the Y1 terminal. The output contacts directly drive safety-rated contactors, drives, or downstream safety PLCs in the machine control architecture.
Typical wiring topology: E-stop button (NC contacts) → PSR-SCP inputs → Safety relay outputs → Contactor coil / Drive enable → Machine actuators.
Sourcing & Quality Verification
- Source: Authorized distribution channel — genuine Phoenix Contact product with full manufacturer traceability.
- Condition: New, original packaging with factory test documentation.
- Batch traceability: Date code and lot number available upon request for quality records.
- Inspection: Each unit undergoes incoming inspection against Phoenix Contact datasheet specifications before dispatch.
- Counterfeit prevention: Holographic labels, part number laser marking, and CE/TÜV certification marks verified on every unit.
Procurement Process
- Confirm part number: Verify PSR-SCP-24DC/ESP4/2X1/1X2 / 2981020 matches your BOM or existing installation.
- Request a quote: Contact support@konmask.com with quantity and required delivery date.
- Order confirmation: Purchase order accepted via email; proforma invoice issued within 1 business day.
- Lead time: In-stock units ship within 2–3 business days; EXW Xiamen or DDP options available.
- Documentation: Commercial invoice, packing list, and certificate of conformity provided with every shipment.
- After-sales support: Technical assistance available via email or WhatsApp for installation and commissioning queries.
Technical FAQ
Q: Can this relay be used with a 24 V AC supply?
A: No. The PSR-SCP-24DC/ESP4/2X1/1X2 is rated for 24 V DC only. For AC supply applications, refer to the PSR-SCP-24UC series.
Q: What is the maximum safety category achievable?
A: Category 4 / PLe per ISO 13849-1 and SIL 3 per IEC 62061, subject to correct wiring and system-level validation.
Q: Is automatic reset supported?
A: Yes. Automatic reset is configurable via the Y1 terminal. Manual reset (monitored) is recommended for E-stop applications per ISO 13849-1.
Q: Can the N/O outputs drive a 230 V AC contactor directly?
A: Yes. Output contacts are rated up to 250 V AC / 6 A, suitable for direct contactor coil switching.
Q: Is this module compatible with Phoenix Contact PSRmodular system?
A: No. The PSR-SCP series is a standalone compact relay. For modular expandable architectures, refer to the PSRmodular product family.
Q: What is the B10d value for mechanical life calculation?
A: Refer to Phoenix Contact’s official SISTEMA library file for PSR-SCP series for certified B10d and MTTFd values for your PLe/SIL 3 calculations.
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