SICK RLY3-EMSS300 1099973 Safety Relays
The RLY3-EMSS300 is a safety relay, part number 1099973, designed for monitoring safety-related switching devices in industrial machinery. It provides 3 safety outputs, supports manual or automatic reset configurations, and operates with a 24 V AC/DC supply. The relay is suited to machine safety circuits where controlled shutdown and reliable monitoring of protective devices are required.
| Brand | SICK |
| Product | Safety Relays |
| Model Number | RLY3-EMSS300 |
SICK RLY3-EMSS300 1099973 Safety Relays - Technical Specifications
| Specification | Value |
|---|---|
| Application | Evaluation unit |
| Supply voltage UB | 24 V DC (16.8 V ... 30 V) |
| Power consumption | ≤ 2.5 W (DC) |
| Ripple | ≤ 2.4 V |
| Enclosure rating | IP20 |
| Connection type | Front connector with spring terminals |
| Dimensions (W x H x D) | 18 mm x 124.6 mm x 85.5 mm |
| Weight | 150 g |
| Ambient temperature, operation | –25 °C ... +55 °C |
| Ambient temperature, storage | –25 °C ... +70 °C |
The SICK RLY3-EMSS300, part number 1099973, is a safety relay developed to evaluate signals from safety devices and control machine shutdown functions. It can monitor devices such as emergency stop pushbuttons and safety switches, then switch its safety-related outputs according to the input status. The relay provides 3 safety outputs for integration into machine safety circuits and contactor control systems.
In industrial applications, the RLY3-EMSS300 can be used in emergency stop circuits, movable guard monitoring, safety door control, and machine access protection. It is practical for packaging machines, assembly equipment, conveyor systems, production machinery, and automated cells where opening a guard or activating an emergency stop must initiate a defined safe response.
As part of the SICK ReLy safety relay family, the RLY3-EMSS300 is designed for dependable operation inside industrial control cabinets. Its compact DIN-rail format helps reduce panel space requirements, while removable terminals simplify installation and servicing. The unit is suited to repetitive machine safety functions where reliable signal evaluation and controlled switching are required during daily production.