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RLY3-OSSD300

The SICK RLY3-OSSD300 is a compact, single-channel safety relay designed to safely monitor emergency stop buttons, safety interlock switches, and other safety devices with a single normally closed (NC) contact. Its primary function is to ensure a machine's hazardous motion is stopped and prevented from restarting when a safety circuit is breached.

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Key Features:

Function: Single-channel safety monitor for emergency stop (e-stop) and safety gate applications (Category 4 / PL e according to ISO 13849-1, when used in a appropriate circuit design).

Input Type: Monitors a single OSSD (Output Signal Switching Device) input. This is typically a 2-wire safety sensor (like a ruggedized proximity switch) or a standard normally closed (NC) contact from an e-stop button.

Outputs: Two safe, force-guided (mechanically linked) relay outputs (K1, K2) with normally open (NO) and normally closed (NC) contacts.

Diagnostics: Features a built-in LED status indicator for power (green) and fault/error detection (red), providing clear visual feedback on the device's state.

Safety Ratings: Complies with major international safety standards, ensuring a high level of performance and reliability for personnel protection.

Design: Compact, DIN rail mountable enclosure for easy integration into control panels.

Primary Application:
The core purpose of the RLY3-OSSD300 is to evaluate the signal from a safety device (like an e-stop button wired in a normally closed loop). If the circuit opens (e.g., the e-stop is pressed), the relay de-energizes, breaking the safe output circuit and triggering the machine's shutdown.