During technical comparisons, RLY3-EMSS300 appears alongside Sick Diffuse Sensor, Sick Rly3 Ossd100 and Sick Safety Relay so engineers assess signal types, ingress protection, and ambient tolerances accurately.
Sick RLY3-EMSS300 Safety Relay
The Sick RLY3-EMSS300 Safety Relay is a high-performance safety relay designed for applications using safety sensors with potential-free outputs. Built to meet stringent safety standards, it's ideal for industrial automation systems demanding SIL 3 protection and dependable diagnostics.
| Brand | Sick |
| Product Type | Safety Relay |
| Product | RLY3-EMSS300 |
Sick RLY3-EMSS300 Safety Relay β Technical Specifications
| Specification | Value |
|---|---|
| Compatible sensor types | Safety sensors with potential-free outputs |
| Safety integrity level | SIL 3 (IEC 61508) |
| Category | Category 4 (ISO 13849-1) |
| Performance level | PL e (ISO 13849-1) |
| TM (mission time) | 20 years (ISO 13849-1) |
| Sensor monitoring | Discrepancy monitoring, Cross-circuit detection |
| Restart interlock | β |
| Reset | Automatic, Manual |
| External device monitoring (EDM) | β |
| Connection type | Front connector with spring terminals |
| Inputs | 2 safety inputs, 1 input for reset pushbutton or external device monitoring (EDM) |
| Outputs | 3 enabling current paths (safe), 2 application diagnostic outputs (not safe), 3 test pulse outputs (not safe) |
| Display elements | LEDs |
| Configuration method | Hard wired |
| Supply voltage VS | 24 V DC (16.8 V ... 30 V) |
| Residual ripple | β€ 2.4 V |
| Power consumption | β€ 2.5 W (DC) |
| Input voltage HIGH | 24 V DC (11 V ... 30 V) |
| Input voltage LOW | 0 V DC (β3 V ... 5 V) |
| Input current | 4 mA ... 6 mA |
| Test pulse width | - |
| Test pulse rate | - |
| Response time | 12 ms |
| Type of output | N/O contacts, positively guided |
| Contact material | Silver alloy, gold flashed |
| Switching voltage | 10 V AC ... 230 V AC, 10 V DC ... 230 V DC |
| Switching current | 10 mA ... 6 A |
| Total current | 12 A |
| Overvoltage category | III (EN 60664-1) |
| Rated impulse withstand voltage Uimp | 6 kV (EN 60664-1) |
| Output voltage HIGH | β₯ Vs β 3 V |
| Output voltage LOW | β€ 3 V |
| Input current (NPN) | β€ 15 mA |
| Output current (PNP) | β€ 120 mA |
| Output voltage | β₯ Vs β 3 V |
| Test pulse interval | 40 ms |
| Dimensions (W x H x D) | 18 mm x 124.6 mm x 85.5 mm |
| Enclosure rating | IP20 (IEC 60529) |
| Ambient operating temperature | β25 Β°C ... +55 Β°C |
| Storage temperature | β25 Β°C ... +70 Β°C |
| Air humidity | β€ 95 %, Non-condensing |
| Interference emission | According to IEC 61000-6-4 |
| Interference resistance | According to IEC 61326-3-1, According to IEC 61000-6-2, According to IEC 60947-5-1 |
| Weight | 150 g |
The Sick RLY3-EMSS300 Safety Relay is a compact and intelligent solution engineered to ensure reliable monitoring of safety functions in industrial automation. As part of Sickβs advanced N/O Output Safety Relay series, the RLY3-EMSS300 provides precise control of safety circuits for machines, conveyors, and robotics systems. Known for its German engineering excellence, Sick combines innovation with long-term reliability, offering maintenance engineers a trusted partner for equipment safety and compliance with SIL 3 and PL e standards.
The RLY3-EMSS300 Safety Relay integrates superior electrical and mechanical performance for demanding safety applications. Designed with 2 safety inputs and 3 enabling current paths, it guarantees redundant protection through positively guided N/O contacts built from silver-alloy, gold-flashed material for durability. Operating at a stable 24 V DC supply voltage and consuming β€ 2.5 W, this relay ensures energy efficiency without compromising safety. It supports both manual and automatic reset modes along with External Device Monitoring (EDM), enabling fault detection in contactors or actuators. The RLY3-EMSS300 meets Category 4 and Performance Level e (ISO 13849-1), providing reliable protection even in critical systems with high operational risk. With a response time of 12 ms, switching voltage up to 230 V AC/DC, and current handling of 6 A per channel, it ensures rapid and precise shutdown in hazardous conditions. The moduleβs IP20 housing and compact size of 18 Γ 124.6 Γ 85.5 mm make it easy to install in tight control panels, while compliance with IEC 61000-6-4 and IEC 61326-3-1 guarantees resistance to electromagnetic interference. Combined with a 20-year mission time, the Sick RLY3-EMSS300 is built for long-term stability and dependability in continuous-operation plants.
In real-world applications, the Sick RLY3-EMSS300 Safety Relay is widely used in robotic cells, packaging machines, press controls, and conveyor systems to achieve reliable emergency stop and safety gate monitoring. Engineers prefer this relay when integrating multiple safety devicesβsuch as limit switches, interlock sensors, and emergency-stop buttonsβinto a single logic chain. The built-in discrepancy monitoring and cross-circuit detection features provide early fault identification, ensuring uninterrupted productivity and minimizing downtime. Maintenance teams appreciate its clear LED indicators and modular wiring that simplifies troubleshooting. For industrial automation projects where precision and reliability matter, the RLY3-EMSS300 stands out as one of the most trusted solutions in the Sick Safety Relay portfolio.
Engineers looking for authentic details can refer to the official Sick RLY3-EMSS300 datasheet and RLY3-EMSS300 manual for installation, wiring diagrams, and performance data. IndMALL helps buyers compare RLY3-EMSS300 price options from verified suppliers offering genuine Sick RLY3-EMSS300 Safety Relays with warranty and technical support. Whether you're sourcing for a new automation project or upgrading existing systems, the RLY3-EMSS300 remains the benchmark for dependable safety performance in industrial environments.
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