The DADI QSRN is a versatile emergency stop safety relay designed to meet the demanding requirements of modern industrial safeguarding. Unlike basic safety relays that only accept dry contact inputs, the QSRN is engineered with a high degree of input flexibility. It can seamlessly monitor traditional dual-channel safety devices like emergency stop buttons and safety interlock switches, while also being directly compatible with the PNP or NPN transistor outputs from modern safety light curtains and photoelectric sensors. This dual-mode input capability simplifies control panel design by eliminating the need for additional signal converters, making it an ideal solution for applications ranging from simple machine guarding to complex automated cells.

From a functional safety perspective, the QSRN is certified to the highest industry standards, achieving Performance Level e (PLe) and Safety Category 4 according to EN/ISO 13849-1, as well as Safety Integrity Level 3 (SIL 3) according to IEC 61508. These certifications, backed by CE and TUV approvals, ensure the relay is suitable for the most critical safety functions. At its core, the QSRN employs three force-guided (positively driven) normally open (NO) safety output contacts and one normally closed (NC) auxiliary contact. This mechanically linked design ensures that a welded safety contact will be detected, preventing the system from being reset and maintaining the integrity of the safety function. The device features full circuit self-checking, which continuously monitors the input channels for faults, including short circuits and signal discrepancies. If an inconsistency or fault is detected, the relay locks itself in a safe state, preventing machine restart.

The QSRN distinguishes itself with several practical engineering features. It exhibits a strong tolerance to residual voltage on input signals, maintaining stable operation even when residual voltages exceed 10V—a common issue in poorly grounded industrial environments. The relay supports both automatic and manually monitored reset modes, and its manual reset function includes a forced single-reset detection, ensuring the reset button must be released before the next cycle can be initiated. Front-panel LED indicators provide clear visual diagnostics for power and output status. The device is powered by a 24V DC supply with a wide tolerance range (+10%/-20%) and consumes just 2.9W of power. Its quick response time of less than 30ms from input to output ensures swift hazard mitigation.

Installation and maintenance are streamlined by the QSRN's compact and modular design. Housed in a durable, flame-retardant PA66 enclosure, the unit measures just 22.5mm in width, allowing for high-density DIN rail mounting within control cabinets. The use of pluggable screw terminals simplifies wiring and accelerates module replacement. The device carries an IP20 protection rating and is designed for operation in ambient temperatures from -25°C to 85°C. With its combination of high-level safety certification, flexible input compatibility, and user-friendly features, the DADI QSRN is a robust and reliable core component for safeguarding industrial machinery, including packaging equipment, machine tools, robotic work cells, and specialized processes requiring two-hand control stations.

Technical Specifications