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Brand: SICK
SICK RLY3-OSSD200 ReLy Safety Relay for OSSD Safety Sensors
Description
RLY3-OSSD200 is a SICK ReLy safety relay (part no. 1085344), an evaluation unit for safety sensors with OSSDs. It is 18 mm wide, has spring-terminal front connectors and is wired hard, so no software is needed. The data sheet lists SIL 3 (IEC 61508), PL e (ISO 13849-1) and category 4 (iso 13849-1); outputs are 2 enabling current paths (safe); 2 application diagnostic outputs (not safe); 1 test pulse output (not safe).
Safety evaluation with the RLY3-OSSD200
The OSSD version is designed to evaluate safety sensors that already have solid-state OSSD outputs, such as safety light curtains and safety laser scanners. The relay checks both channels for sequence (the data sheet lists sequence monitoring) and opens its enabling current paths when a protective device trips, with restart interlock and external device monitoring available.
Safety figures as printed: SIL 3 (IEC 61508), Category 4 (ISO 13849-1), PL e (ISO 13849-1), PFHD 1.0 x 10⁻⁹, mission time 20 years (ISO 13849-1), stop category 0 (IEC 60204-1). Reset: automatic; Manual. The two enabling current paths are N/O contacts, positively guided, switching 10 V AC … 230 V AC and 10 mA … 6 A up to a total of 12 A. Response time 10 ms.
Technical specifications
| Parameter | Specification |
|---|---|
| Type code | RLY3-OSSD200 |
| Part number | 1085344 |
| EAN | 4047084415197 |
| Product family | ReLy |
| Applications | Evaluation unit |
| Compatible sensor types | Safety sensors with OSSDs |
| Safety integrity level | SIL 3 (IEC 61508) |
| Category | Category 4 (ISO 13849-1) |
| Performance level | PL e (ISO 13849-1) |
| PFHD (mean probability of a dangerous failure per hour) | 1.0 x 10⁻⁹ |
| Stop category | 0 (IEC 60204-1) |
| Sensor monitoring | Sequence monitoring |
| Restart interlock | Yes |
| Reset | Automatic; Manual |
| External device monitoring (EDM) | Yes |
| Connection type | Front connector with spring terminals |
| Inputs | 2 safety inputs; 1 input for reset pushbutton or external device monitoring (EDM) |
| Outputs | 2 enabling current paths (safe); 2 application diagnostic outputs (not safe); 1 test pulse output (not safe) |
| Display elements | LEDs |
| Configuration method | Hard wired |
| Voltage supply | PELV or SELV |
| Supply voltage VS | 24 V DC (16.8 V … 30 V) |
| Residual ripple | ≤ 2.4 V |
| Power consumption | ≤ 2.5 W (DC) |
| Safety inputs: Number | 2 |
| Safety inputs: Input voltage HIGH | 24 V DC (11 V … 30 V) |
| Safety inputs: Input voltage LOW | 0 V DC (–3 V … 5 V) |
| Safety inputs: Input current | 4 mA … 6 mA |
| Safety inputs: Test pulse width | ≤ 1 ms |
| Safety inputs: Test pulse rate | ≤ 10 Hz |
| Reset pushbutton or external device monitoring (EDM) input: Number | 1 |
| Reset pushbutton or external device monitoring (EDM) input: Input voltage HIGH | 24 V DC (11 V … 30 V) |
| Reset pushbutton or external device monitoring (EDM) input: Input voltage LOW | 0 V DC (–3 V … 5 V) |
| Reset pushbutton or external device monitoring (EDM) input: Input current | 4 mA … 6 mA |
| Enabling current paths: Response time (opening of enabling current paths) | 10 ms |
| Enabling current paths: Number | 2 |
| Enabling current paths: Type of output | N/O contacts, positively guided |
| Enabling current paths: Contact material | Silver alloy, gold flashed |
| Declarations and certificates in the data sheet | EU declaration of conformity; UK declaration of conformity; ACMA declaration of conformity; China RoHS; CCC certificate; UK-Type-Examination approval; cULus certificate; EAC certificate / DoC; cTUVus certificate; S Mark certificate; EC-Type-Examination approval; EC-Type-Examination approval (Machinery Directive); EC-Type-Examination approval (Machinery Regulation); Third party certificate |
Type code RLY3-OSSD200 and part number 1085344
RLY3-OSSD200 is catalogued under part number 1085344 in the ReLy line. Short type codes hide the input side: the letters after RLY3 tell you which kind of safety sensor the unit expects, so a wrong guess means the sensor cannot be connected as intended. Quote the part number, and describe the sensors on your machine (light curtain, scanner, door switch or emergency stop) so we can confirm the match.
Cabinet installation and validation checklist
The relay is a DIN-rail unit only 18 mm wide, intended for a control cabinet (IP20 (IEC 60529), ambient –25 °C … +55 °C, supply 24 V DC (16.8 V … 30 V)). Before putting a machine into service, check: input wiring and test pulses, reset type (automatic or manual), EDM loop to the contactors, and the actual response time of the whole chain, since the relay opens its paths in 10 ms but the actuators add their own delay. Keep the performance level calculation for the complete safety function on file.
Documents and quotation
Attached: the unaltered SICK data sheet for RLY3-OSSD200, part number 1085344. It is the reference if anything on this page needs checking. Tell us the quantity and the delivery location in the RFQ form, quoting the part number above, and we will come back with a quotation. Related items are listed under Safety Switches & Guard Locking. Before ordering, confirm that output polarity, connection and range match your controller and the device being replaced. If this page and the data sheet ever differ, the data sheet applies.
Datasheets & Documents
- Data Sheet SICK RLY3-OSSD200 official data sheet (part no. 1085344) Download
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About brand
SICK is the German maker of industrial sensors: photoelectric and proximity sensors, safety laser scanners and light curtains, encoders, distance sensors, code readers and gas analysers. Erwin Sick, an optics engineer, founded it in Munich in 1946, and in 1952 it introduced its first marketable accident-prevention light curtain, which protected press operators by stopping the machine when a hand broke the light beam. The company moved to Waldkirch in the Black Forest in 1956 and is still headquartered there. It is a privately held company, and has been an Aktiengesellschaft (AG) since 1996.
SICK company profile
| Founded | 1946, Munich, Germany, by Erwin Sick (1909–1988) |
|---|---|
| Headquarters | Waldkirch, Baden-Württemberg, Germany (since 1956) |
| Ownership | Privately held; after the founder's death in 1988 his widow Gisela Sick became the main shareholder. Legal form SICK AG since 1996 |
| Size | More than 12,000 employees and group revenue of about EUR 2.3 billion (company figures for 2023) |
| First breakthrough | Accident-prevention light curtain for presses, shown in Hanover in 1952 |
| International growth | First foreign subsidiary in France in 1972, United States in 1976; today sales and service companies worldwide |
| Product families | Photoelectric, inductive, capacitive, magnetic and ultrasonic sensors; safety laser scanners, light curtains, safety controllers and relays; encoders and motor feedback systems; distance sensors and LiDAR; barcode and 2D code readers and machine vision; gas analysers, dust and flow measurement for process and emissions monitoring |
Milestones
- 1946: Erwin Sick receives a licence to run his engineering firm in Munich.
- 1952: The first marketable accident-prevention light curtain is presented in Hanover and goes into series production.
- 1956: The company moves to Waldkirch with 25 employees.
- 1972 and 1976: Subsidiaries are founded in France and the United States.
- 1996: SICK becomes an Aktiengesellschaft.
- Today: Sensors for factory and logistics automation, machine safety and process analysis, with a large share of revenue outside Germany.
Choosing a SICK sensor
For object detection, the sensing principle comes first. A retro-reflective sensor (WL series) sends light to a reflector and switches when an object breaks the beam; it is reliable over long distances and easy to align. A sensor with background suppression (WTB series) detects an object at a set distance and ignores what is behind it, which suits conveyors with shiny or dark backgrounds. A through-beam pair (WS/WE) gives the longest range and the highest reliability in dust. For transparent bottles and film, use a model built for transparent objects (for example WL12G-3B or WL150-P420). The digits in the code also matter: "P" usually means a PNP output and "N" NPN, and the last digits set the connector or cable. For machine guarding, a safety laser scanner such as nanoScan3 or microScan3 protects an area, while a safety controller such as Flexi Soft combines several safety devices.
Where SICK products are used
In Oman and the GCC, SICK sensors are used in packaging and bottling lines, food and beverage plants, logistics and airport baggage handling, cement and steel plants, ports and cranes, automated warehouses, and on machines built by European OEMs. SICK safety scanners guard robots and automated guided vehicles, and its encoders give position feedback on motors, hoists and conveyors.
SICK products we list
| Family | Examples |
|---|---|
| Photoelectric sensors | WL12-3P2431, WTB12-3P2431, GTB6-P4211, VL18-4P3240, WL12G-3B2531, WS/WE100, KT5W contrast, W26 IO-Link |
| Proximity, cylinder and ultrasonic sensors | IME12-08NPSZC0S, IME18-05BPSZC0S, MZT8, UM18 4-20 mA, UM30, UFN3 fork |
| Machine safety | nanoScan3, microScan3, S300 Professional, Flexi Soft FX3-CPU1, FX3-XTIO, ReLy OSSD |
| Encoders and motor feedback | DFS60B, AFM60 PROFINET, AFS60 SSI, ATM60 PROFIBUS, SRS50, EFS50 |
| Distance sensors and code readers | DT50, DL50, DT35, Lector632 |
Ordering SICK products: what we need
Send the type code and the 7-digit SICK part number from the label (for example WTB12-3P2431 together with its part number). For a replacement sensor, add the output (PNP or NPN), connection (M8, M12 or cable) and sensing distance. For encoders, add the interface (incremental, SSI, PROFIBUS, PROFINET), resolution and shaft type. For safety scanners, tell us the model and whether the existing configuration needs to be kept.
Facts checked against SICK's published company history and annual figures, October 2026.
Browse SICK products by category: Sensors & Transmitters.
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Frequently Asked Questions
Which sensors can the RLY3-OSSD200 evaluate?
Safety sensors with OSSDs
What safety level is printed in the data sheet?
SIL 3 (IEC 61508), Category 4 (ISO 13849-1), PL e (ISO 13849-1), PFHD 1.0 x 10⁻⁹.
What does it switch?
2 enabling current paths (safe); 2 application diagnostic outputs (not safe); 1 test pulse output (not safe)
What supply voltage does it need?
24 V DC (16.8 V ... 30 V)
Which part number is this?
Part no. 1085344, type code RLY3-OSSD200.
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