Phoenix Contact PSR-SCP-24DC/ESP4/2X1/1X2 Safety Relay (2981020)

Overview

The Phoenix Contact PSR-SCP- 24DC/ESP4/2X1/1X2 (part number 2981020) is a single-channel, forcibly-guided safety relay module purpose-built for emergency stop and safety-door monitoring circuits up to SIL 3 and Category 4 / PL e per EN ISO 13849. Housed in a compact 22.5 mm-wide DIN-rail enclosure with plug-in screw terminal blocks, the PSR-SCP series belongs to the PSRclassic family that has become a de-facto standard on machine safety panels, skid packages, and process safety loops throughout the region. The relay accepts a 24 V DC control supply and provides 2 forcibly-guided enabling (N.O.) current paths plus 1 signalling (N.C.) contact, giving panel builders a compact, field-proven building block for wiring emergency stop pushbuttons, safety gate switches, and light curtains into a fail-safe shutdown path.

As an authorized supplier of genuine Phoenix Contact components in Oman, Seven Star LLC sources the PSR-SCP-24DC/ESP4/2X1/1X2 directly through verified distribution channels, so every unit shipped to a customer in Muscat, Sohar, Salalah, or elsewhere in the GCC carries full manufacturer traceability, current date codes, and complete certification documentation. This matters for safety-critical applications, where an unverified or grey-market relay can silently compromise a validated SIL rating during a third-party audit.

Measurement & Operating Principle

The PSR-SCP-24DC/ESP4/2X1/1X2 works on the principle of forcibly-guided (mechanically linked) relay contacts: the internal N.O. and N.C. contact sets are mechanically coupled so that a welded or stuck N.O. contact physically prevents the N.C. signalling contact from closing, giving the control system a reliable diagnostic signal that a hazardous condition may exist. On power-up, the module executes an automatic or manual monitored start-up test (selectable), verifying that both enabling current paths and the feedback loop are healthy before allowing the two forcibly-guided outputs to energize. Typical response time from a de-energized emergency stop input to open enabling contacts is around 60 ms, with a release time near 20 ms, fast enough to satisfy stopping-time calculations on most Category 3/4 machine guarding circuits.

The 24 V DC input/start and feedback circuit accepts a typical inrush current below 1 A, while the rated control supply current is approximately 50 mA DC. Because the two enabling paths are physically guided rather than logically monitored, the relay delivers a hardware-verifiable safety function that does not depend on firmware or software integrity, an important distinction for process plants that need a safety function with no common-cause software failure mode between redundant channels.

Engineering Design & Construction

Build quality follows Phoenix Contact’s established PSRclassic housing platform: a dust-proof, forcibly-guided relay mechanism inside a flame-retardant polyamide (PA), non-reinforced enclosure rated for both horizontal and vertical DIN rail mounting. Contacts are AgSnO2, gold-flashed for reliable low-current switching as well as higher inductive loads, rated up to 250 V AC/DC with a limiting continuous current of 6 A per enabling path in high-demand mode (4 A in low-demand mode). Termination is via M3 plug-in screw terminal blocks, allowing the relay to be pre-wired on a bench and plugged into the base during panel commissioning, a detail that materially speeds up machine-safety retrofits on live production lines.

The relay carries an approximate mechanical service life of 10^7 operating cycles and degree of protection rated for standard control-panel environments (IP20 terminals, IP54 relay body per datasheet). Approvals include SIL 3 high- and low-demand ratings, EN ISO 13849 Category 4 / PL e, and EN 50156 for furnace and combustion safety circuits — the last of which is particularly relevant to Omani refinery and power-generation customers running burner management systems that require an independently certified safety relay stage ahead of the BMS logic solver.

Key Features

• SIL 3 (high and low demand) and Category 4 / PL e safety rating per EN ISO 13849
• 2 forcibly-guided N.O. enabling current paths + 1 N.C. signalling contact
• 24 V DC control supply, automatic or manual monitored start selectable
• Typical response time ~60 ms, release time ~20 ms
• AgSnO2 gold-flashed contacts rated 250 V AC/DC, 6 A
• Compact 22.5 mm DIN-rail housing with plug-in M3 screw terminals
• EN 50156 approval for burner/combustion safety circuits
• Approximately 10^7 mechanical operating cycle service life

Industrial Applications

The PSR-SCP-24DC/ESP4/2X1/1X2 is specified into emergency stop circuits on packaging and conveying lines, safety-gate interlocks on CNC and robotic work cells, light-curtain monitoring on press and stamping equipment, and burner management safety trains on gas-fired boilers and process heaters. Its forcibly-guided design also makes it a standard building block in two-hand control stations and safety mats where a hardware-verifiable feedback path is required by the machine risk assessment.

In Oman’s oil and gas, petrochemical, and desalination sectors, Seven Star LLC supplies this relay to EPC contractors and maintenance teams retrofitting legacy emergency stop circuits to current EN ISO 13849 requirements, as well as to OEM panel builders across the GCC standardizing on the Phoenix Contact PSRclassic platform for machine safety compliance. Local stock and application support reduce the lead time typically associated with importing certified safety relays directly from Europe.

Technical Specifications

Why Buy From Seven Star LLC

Seven Star LLC is an authorized supplier of genuine Phoenix Contact safety and automation components across Oman and the GCC. Request a quotation for the PSR-SCP-24DC/ESP4/2X1/1X2 safety relay, including current lead time, certification documents, and volume pricing for panel-builder and EPC orders — our engineering team can also help cross-reference legacy safety relay part numbers to the current PSRclassic platform.