Phoenix 2981800 Safety Relay

Core Application: Single-channel safety relay for Emergency Stop and Safety Gate monitoring. It complies with safety rating SIL 3 / Cat.4 PL e, with 0.1–30s adjustable power-off delay. Suitable for protection scenarios of automated equipment requiring safety stop delay.

2. Core Specifications

3. Accessory List & Installation Guidelines

3.1 Standard Accessories

Safety relay unit ×1

Installation manual ×1

Terminal marking label ×1

Fixing clip ×2 (for DIN rail locking)

Delay adjustment screwdriver ×1 (special tool)

3.2 Installation Precautions

1. Mounting Requirement: Install on standard 35mm DIN rail; maintain ≥5mm clearance from adjacent modules for heat dissipation.
2. Wiring Specification:

Control Circuit: Connect DC24V to A1(+)、A2(-)

Safety Input: Connect E-stop / safety gate contact to S11、S12 (NC contact preferred)

Safety Output: Connect safety circuit (e.g. contactor coil) to 13-14、23-24

Auxiliary Output: Connect alarm / indication circuit to 31-32、41-42

3. Reset Setting:

Auto Reset: Automatically restore after power cycle

Manual Reset: Requires external reset signal or manual reset button operation

4. Delay Adjustment: Use the dedicated screwdriver to adjust the front panel potentiometer to set 0.1–30s power-off delay.
5. Cross-model & Cross-brand Replacement

4.1 Phoenix Contact Same Series Alternative Models

4.2 Cross-brand Equivalent Solutions

5. Selection & Replacement Guidelines

5.1 Core Selection Criteria

✅ Safety Level Matching: Ensure required safety rating (SIL/PL/Cat.) does not exceed product capability (SIL 3 / Cat.4 PL e).

✅ I/O Requirement:

Input: 1 channel sufficient; confirm NC or NO contact type.

Output: Verify 2 safety + 2 auxiliary contacts meet control demands.

Contact Capacity: Ensure load current ≤2.5A (AC-15/DC-13).

✅ Delay Requirement: Confirm 0.1–30s adjustable range covers equipment stopping time.

✅ Reset Mode: Select auto or manual reset according to operation needs.

✅ Environmental Adaptation: Operating temperature ≤60℃ and humidity within industrial standard range.

5.2 Upgrade & Replacement Options

Option A: Same Series Function Upgrade

More channels: 2981800 → 2981810 (2 channels, 4 safety contacts)

Add alarm output: 2981800 → 2981820 (with alarm output)

Shorter delay: 2981800 → 2981801 (0.1–10s) or 2981802 (0.1–1s)

Option B: Migrate from PSRclassic to PSRmini (Space Optimization)

Replacement Model: 2981900 (PSRmini-SCP-24DC/ESD/4X1/30)

Advantage: Only 17.5mm width (5mm narrower), identical functions, saves cabinet space.

Option C: Migrate from PSRclassic to PSRmodular (System Expansion)

Solution: PSRmodular system + safety function modules

Advantage: Multi-channel expandable; integrates safety gate, E-stop, light curtain and other safety functions, suitable for complex safety systems.

5.3 Common Troubleshooting

Phoenix Contact 2981800 (PSR-SCP-24DC/ESD/4X1/30) is a single-channel safety relay with adjustable power-off delay, specially designed for emergency stop and safety gate monitoring, reaching the highest safety level SIL 3 / Cat.4 PL e. Its 22.5mm slim design and plug-in wiring facilitate installation and maintenance, while the 0.1–30s adjustable delay adapts to various equipment shutdown requirements. During selection, focus on safety rating, I/O configuration, delay range and reset mode. For upgrade, choose extended models in the same series or migrate to PSRmini / PSRmodular for space saving or system expansion.

Complete Model List of Phoenix Contact Safety Relays (Structured Classification)

1. Model Naming Rule Overview

2. PSRclassic Series (Standard Safety Relays)

2.1 E-Stop / Safety Gate (SCP Series)

2.2 Standard Safety Function (SPP Series)

2.3 Light Curtain Monitoring (SCR Series)

2.4 Two-Hand Control (SCT Series)

3. PSRmini Series (Micro Compact, 17.5mm Width)

3.1 Basic Safety Function (MC Series)

3.2 Safety Monitoring Module (MS Series)

4. PSRmodular Series (Modular Safety System)

4.1 Main Control Module

4.2 Expansion Module

5. PSRmotion Series (Motion Monitoring Safety Relay)

5.1 Zero Speed / OverSpeed Monitoring

5.2 Rotation Direction Monitoring

6. Safety Coupling Relays (PSR-SCP/SPP Series)

7. Key Selection Parameter Comparison

8. Supplementary Notes

8.1 Series Positioning

PSRclassic: Standard type with complete functions, width starting from 22.5mm, suitable for conventional safety applications.

PSRmini: Micro compact type, only 17.5mm width, saves cabinet space.

PSRmodular: Configurable modular system, suitable for complex safety systems with expandable functions.

PSRmotion: Dedicated for motion monitoring, applicable to motor zero-speed / overspeed / rotation direction safety control.

8.2 Replacement Information

Old models are gradually phased out; priority recommended to select models manufactured after 2020.

Some models are discontinued; refer to Phoenix Contact official website or technical support for replacement.

8.3 Safety Certification

Full series certified by CE, UL, CSA, TÜV, compliant with IEC 61508 and EN ISO 13849-1.

Partial models with ATEX certification for explosive atmosphere applications.