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Safety Relay – A Safety Solution That Meets Most Automation Industry Requirements

Safety Relay – A Safety Solution That Meets Most Automation Industry Requirements

2025/3/4

Safety Relay – A Safety Solution That Meets Most Automation Industry Requirements

Safety relay/safety relays DADISICK

Functional Definition of Safety Relays

Safety relays are critical execution units in functional safety systems. Through redundant circuit design, real-time self-testing, and force-guided contact mechanisms, they ensure reliable disconnection of equipment power sources and activation of a safe shutdown when hazardous events (e.g., emergency stop activation, safety light curtain interruption) or internal faults are detected. They support multi-channel inputs (e.g., dual-contact emergency stop buttons, safety door interlocks) and logical combinations (e.g., two-hand control, zone interlocking), complying with the Performance Level (PL) requirements defined in ISO 13849-1.

With the advancement of industrial networking, safety relays integrated with protocols such as PROFIsafe and EtherNet/IP CIP Safety enable real-time data exchange with higher-level control systems. They provide fault diagnostics, event logging, and predictive maintenance support, aligning with the dual demands of safety and availability in smart manufacturing applications (e.g., automotive welding lines, safety control systems for packaging machinery).

Relying on Safety Technology Standards

Our safety relays are engineered for the highest level of industrial safety, meeting stringent global standards. 

For Example: Safety Relay Module LS-2A4S

Performance Level (PL): PL e, compliant with EN ISO 13849.

Safety Category (Cat.): Cat. 4, compliant with EN ISO 13849.

MTTFd: ≥ 20 years, compliant with EN ISO 13849.

Diagnostic Coverage (DC): ≥ 99%, compliant with EN ISO 13849.

Safety Integrity Level (SIL): SIL 3, compliant with IEC 61508 and IEC 62061.

Hardware Fault Tolerance (HFT): 1, compliant with IEC 61508 and IEC 62061.

Safe Failure Fraction (SFF): ≥ 99%, compliant with IEC 61508 and IEC 62061.

PFHD: ≤ 1.86E-9/h, compliant with IEC 61508 and IEC 62061.

Stop Category: 0, compliant with EN 60204-1.
Benefits of the safety relays LS series

Safety Relay Wiring Diagram

Quickly and easily integrate various safety sensors into the safety circuits of machines and systems.

Typical Safety Relay Wiring Diagrams:
Safety Relay LS-2A4S
Safety Relay Wiring Method with Four Emergency Stop Button Inputs
Safety Relay LS-3A1B.C
Safety Relay Wiring Method with Dual-Channel Emergency Stop Button Input
Four Emergency Stop Button Inputs with Safety Relay Module
Description:
Input Components: CH1 (Emergency Stop Button); CH2 (Emergency Stop Button); CH3 (Reset Button)
Input Components: CH4 (Emergency Stop Button); CH5 (Emergency Stop Button); CH6 (Reset Button)
Control Logic: CH1 & CH2, CH4 & CH5
Reset Mode: Manual Reset
Output Delay: 0 s

Safety Category: Cat. 4
Performance Level: PL e
Safety Integrity Level: SIL 3
Dual-Channel Emergency Stop Button Input with Safety Relay
Description:
Dual-Channel Emergency Stop Button Input
Short-Circuit Monitoring Between Channels
Manual Reset
With Output Contact Feedback
Suitable for the Highest Safety Category 4

Components:
S1: Dual-Channel Emergency Stop Button
S3: Reset Button
K7, K8: Contactors
F1: External Fuse Protection
M1: Motor

How to Find the Right Safety Relay for Your Application

Safety relay working principle
1️⃣Safety Zones/Number of Safety Functions
2️⃣Expandable Safety Relays
3️⃣Power Supply Voltage
4️⃣Configurable Parameters
5️⃣Compact Design

Safety Relay Selection
Safety Relay Features Overview
DADISICK Safety Relay Features Overview
LS-3A1B.C – Cost-effective solution
Suitable for various machinery, compatible with emergency stop buttons, safety doors, and PNP-type safety light curtains.
▪️Dimension: 114.5 × 99 × 22.5 mm
▪️Outputs: 3 NO (Normally Open) safety outputs, 1 NC (Normally Closed) auxiliary output
▪️Functions: Supports single/dual-channel operation, manual/automatic reset, and short-circuit monitoring between channels
▪️Key Feature: Economical and efficient, ideal for standard machine safety applications


LS-2A4S – Safety relay module
Designed for intelligent safety control, supporting multiple switching-type safety device inputs.
▪️Dimension: 114.5 × 99 × 45 mm
▪️Inputs: Supports up to 6 safety device inputs (such as emergency stop buttons, safety doors, two-hand switches, etc.)
▪️Outputs: 2 relay safety outputs, 4 semiconductor safety outputs
▪️Functions: Safety logic can be configured via software to meet various application requirements
▪️Key Feature: Flexible and expandable, suitable for complex safety systems

Ter-A – Multi-Type Safety Sensor Compatibility
Supports a wide range of safety sensors, making it ideal for multi-sensor applications.
▪️Dimension: 112 × 99.5 ×22.6 mm
▪️Compatible Devices: Emergency stop buttons, Safety switches, Safety door locks, Safety light curtains, Safety scanners, Safety sensors, Safety edges, Safety mats, Two-hand switches
▪️Key Feature: Highly compatible with various safety detection devices, suitable for complex industrial safety control

LS-A – Economical Safety Relay
Designed for basic safety control, compatible with standard safety devices such as emergency stop buttons and safety door locks.
▪️Dimension: 114.5 × 99 × 22.5 mm
▪️Compatible Devices: Emergency stop buttons, Safety switches, Safety door locks, Safety light curtains, Safety scanners, Two-hand switches, Safety sensors
▪️Key Feature: High cost-performance ratio and simple design, ideal for standard safety applications

QSRN – Specifically designed for safety light curtains
Specifically designed for monitoring safety light curtains, ensuring reliable detection performance.
▪️Dimension: 117 × 100 × 22.5 mm


Recommended Safety Relays

Safety Relay LS-2A4S
Supports up to 6 safety device inputs, 2 relay safety outputs, and 4 semiconductor safety outputs. Configurable via setup software to define safety control logic, meeting various on-site application requirements.
Safety Relay LS-3A1B.C
A safety relay with 3 NO (normally open) safety output contacts and 1 NC (normally closed) auxiliary output contact. It supports single or dual-channel operation, manual or automatic reset, and features short-circuit monitoring between channels.
Safety Relay Ter-A
3NO + 1NC safety contacts
Auto/manual reset option
Redundant self-monitoring circuit ensures reliability
Automatic contact testing in each cycle
Safety Relay LS-A
3NO + 1NC safety contacts
Auto/manual reset option
Configurable for E-stop, light curtains, door locks, and two-hand control switches

Related Safety Sensors

QCE42-30-1230 2BB|Safety Light Curtain|DADISICK
Beam spacing: 30mm Number of optical axes: 42 Protection height: 1230mm Safety light curtain outputs (OSSD)2 PNP
DT11 series|PVC safety Mats|DADISICK
Safety carpet is a technology that monitors the pressure distribution on the carpet through pressure sensing.
OX-W2-2O/2C-GC-J | Safety Locking Devices | DADISICK
Used for monitoring places such as safety doors and windows.
DB-PSE series|Safety Edges|DADISICK
Safety Edges is a technology that monitors the pressure distribution on the carpet through pressure sensing.

DADISICK si è sempre impegnata in prodotti di sensori di sicurezza di fascia alta, concentrandosi sulla ricerca e sviluppo tecnologico e sull'innovazione di prodotto. I nostri prodotti sono ampiamente utilizzati in settori quali apparecchiature di automazione, produzione meccanica, produzione automobilistica e produzione elettronica, contribuendo a ridurre il tasso di incidenti industriali e a garantire la sicurezza dei dipendenti. Continuiamo a introdurre nuovi prodotti che soddisfano le richieste del mercato, fornendo supporto per la produzione di sicurezza aziendale.

*Servizi di sostituzione: in un mercato altamente competitivo, le aziende devono migliorare continuamente i propri prodotti per mantenere la quota di mercato. Forniamo servizi di sostituzione dei sensori di sicurezza.

*Migliorare o adattare le linee di prodotto: quando un'azienda entra in nuovi mercati o cambia focus, potrebbe aver bisogno di perfezionare la propria linea di prodotti. Offriamo prodotti di sensori di sicurezza e supporto tecnico per questa transizione.

*Monitorare lo stato di funzionamento delle apparecchiature nel settore dell'automazione , arrestare o regolare tempestivamente le azioni delle macchine per garantire la sicurezza del processo di produzione.

*Monitoraggio della produzione meccanica dei componenti in movimento, prevenzione di potenziali pericoli, salvaguardia della sicurezza dei dipendenti e del regolare funzionamento della linea di produzione.

*La sicurezza nella produzione automobilistica monitora i processi ad alto rischio sulle linee di assemblaggio dei veicoli, migliorando la sicurezza dei lavoratori e l'efficienza della produzione.

*Industria chimica Monitoraggio in tempo reale dell'ambiente di produzione, per garantire la sicurezza nella manipolazione di sostanze tossiche e pericolose.

*Industria alimentare e delle bevande Monitorare il funzionamento delle apparecchiature della linea di produzione, prevenire la contaminazione e lo spreco di cibo.

*Logistica e magazzinaggio Utilizzati per la navigazione AGV e l'elusione degli ostacoli, garantiscono il trasporto sicuro delle merci.

*Nei settori della lavorazione del legno, tessile, della fabbricazione della carta, della stampa, della gomma e della plastica, tra gli altri, i sensori di sicurezza vengono utilizzati per monitorare vari processi di produzione, garantendo sicurezza ed efficienza.