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El Schmersal SRB301MC-24V is a high-performance safety relay module. Its core advantages include 3 safety contacts plus 1 salida de señal, DETENER 0 stop category, Performance Level e (pl y) and diagnostic coverage ≥99%. It is widely deployed in safety protection systems for various industrial automation equipment. Featuring a dedicated design for magnetic safety switches and cross-wire detection function, it delivers outstanding performance in safety gate monitoring applications. Please check compatibility with safety input devices during model selection, and strictly follow wiring specifications during installation to ensure safe and reliable system operation.
- Explicación del código del modelo
The SRB301MC-24V is a safety relay module of the PROTECT SRB series manufactured by Schmersal, Alemania. The breakdown of the model code is as follows:
| Segmento de código | Definición |
| SRB | código de serie: Safety Relay Block |
| 301 | Function code: 3 safety contacts and 1 salida de señal, compatible with single/dual-channel safety inputs |
| MC | Characteristic code: Designed for signals from BNS series magnetic safety switches, supports cross-wire detection |
| 24V | Tensión de funcionamiento nominal: 24VCA/CC, compatible with AC and DC power supply |
Order Numbers: 101190684 (Versión estándar), 161190684 (International Version), 151190684 (China Version)
- Especificaciones técnicas principales
| Categoría | Datos técnicos | Observaciones |
| Especificaciones generales | ||
| Tipo | Safety monitoring module, emergency stop safety relay | DETENER 0 stop category |
| Voltaje de funcionamiento | 24V y (-15%/+10%) / 24En DC (-15%/+40%) | Maximum ripple voltage: 10% |
| Consumo de energía | 2W. | Low power consumption design |
| Protección de ingreso | IP20 (Terminales) / IP40 (Alojamiento) | Suitable for control cabinet installation |
| Características de entrada | ||
| Monitoring Channels | Switchable single/dual channel | Cross-wire detection supported |
| Tipo de entrada | Passive contacts / Active signals (AOPDs) | Compatible with safety light curtains, emergency stop buttons, etc.. |
| Corriente de entrada | >500mamá | Reset time of monitoring circuit: aprox. 1 segundo |
| Características de salida | ||
| Contactos de seguridad | 3 contactos (2CAROLINA DEL NORTE + 1NO) | DC13: 24V/6A; AC15: 230V/6A |
| Signal Output | 1 contacto auxiliar | For status indication or alarm |
| Nivel de rendimiento | pl y (Highest level) | Compliant with EN ISO 13849-1 |
| Safety Category | Categoría 4 | Compliant with EN IEC 61508 |
| Diagnostic Coverage | ≥99% | High reliability design |
| Características físicas | ||
| Dimensiones | 22.5mm × 100mm × 121mm | Montaje en carril DIN, ahorro de espacio |
| Montaje | 35carril DIN estándar mm | Montaje industrial estándar |
| Temperatura de funcionamiento | -25°C ~ 60°C | Wide temperature range for industrial environments |
| Terminales | Terminales de tornillo | Cable cross-section: 0.25mm² ~ 2.5mm² |
| Certificaciones | BG, UL, CSA, CE | Cumple con los estándares internacionales de seguridad. |
- Cross-Brand Compatibility List
| Marca | Modelo de reemplazo | Compatibility Description |
| Schmersal | SRB E 301MC-24V (103014374) | Enhanced replacement, fully compatible with improved performance |
| siemens | 3SK1111-1AB30 | Equivalent safety relay, 3 contactos de seguridad, 24En DC |
| Schneider | XPSAC5121 | 24VCA/CC, 3 safety contacts and 1 salida de señal |
| Omrón | G9SA-321-T075 | 24En DC, 3 contactos de seguridad, DETENER 0 stop category |
| TEJIDO | MSR132TP | 24VCA/CC, 3 contactos de seguridad, single/dual channel |
Selection Guideline: Match voltage and contact quantity; do not downgrade safety performance level; keep identical mounting dimensions.
- Full Model List of SRB Series
| Modelo | Voltaje | Configuración de contacto | Funciones especiales | Número de orden |
| SRB301MC-24V | 24VCA/CC | 3 Seguridad (2NC+1NO) + 1 Señal | For magnetic switches, cross-wire detection | 101190684 |
| SRB301MC-24V-STSS | 24VCA/CC | 3 Seguridad (2NC+1NO) + 1 Señal | Protección contra cortocircuitos, for magnetic switches | 101190685 |
| SRB301-24V | 24VCA/CC | 3 Seguridad (2NC+1NO) + 1 Señal | General type, no optimization for magnetic switches | 101190686 |
| SRB302MC-24V | 24VCA/CC | 4 Seguridad (3NC+1NO) + 1 Señal | Dual-gate monitoring, for magnetic switches | 101190687 |
| SRB301MC-110V | 110V y | 3 Seguridad (2NC+1NO) + 1 Señal | For magnetic switches, high voltage version | 101190688 |
| SRB301MC-230V | 230V y | 3 Seguridad (2NC+1NO) + 1 Señal | For magnetic switches, high voltage version | 101190689 |
- Fallos comunes & Solución de problemas
| Fenómeno de falla | Posibles causas | Soluciones |
| Indicador de encendido apagado | 1. Power disconnected or abnormal voltage | 1. Check power connection and voltage (20.4V~28.8V) |
| 2. Internal fuse blown | 2. Replace 2A internal fuse | |
| Safety contacts fail to operate | 1. Abnormal input signal | 1. Inspect safety input devices (Molestar, light curtains, etc.) |
| 2. Incorrect cross-wire detection setting | 2. Adjust QS switch (Arriba: cross-wire protection off; Abajo: cross-wire protection on) | |
| 3. Damaged contacts | 3. Replace the safety relay module | |
| No signal output | 1. Safety circuit not reset | 1. Check reset conditions (manual/automatic reset) |
| 2. Damaged signal output contacts | 2. Test continuity of signal contacts | |
| Frecuentes disparos en falso | 1. Interferencia electromagnética | 1. Add shielding and keep away from interference sources |
| 2. Poor cable connection | 2. Recheck cable connections | |
| 3. Temperatura ambiente fuera de rango | 3. Ensure temperature within -25°C ~ 60°C |
Check power first, then inputs; wrong settings are common causes; watch out for interference and reset requirements.
- Entornos de aplicación & Casos de la industria
6.1 Escenarios aplicables
Machinery Safety Protection: Emergency stop systems for injection molding machines, punch presses, press brakes and other stamping equipment
Líneas de producción de automatización: Signal processing for safety light curtains to prevent personnel from entering hazardous areas
Logística & almacenamiento: Safety gate monitoring for stackers and conveyors with BNS magnetic safety switches
Maquinaria de embalaje: Safety interlock for filling and labeling machines to ensure operational safety
Fabricación de automóviles: Safety zone monitoring for welding robots and coating lines
6.2 Escenarios no recomendados
Harsh outdoor environments: IP20 protection rating is not suitable for outdoor installation
Highly corrosive environments: No anti-corrosion coating, incompatible with acid, alkali and corrosive media
High vibration environments: Vibration over 5g may shorten relay service life
High temperature over 60°C: Will degrade performance and service life
6.3 Casos de aplicación
Caso 1: Stamping Production Line for Automotive Parts
Solicitud: Emergency stop system and signal processing of safety light curtains for 3 punch presses
Configuración: One SRB301MC-24V installed on each press, connected with emergency stop buttons and safety light curtains
Efecto: Realizes instant STOP 0 shutdown with diagnostic coverage ≥99%, reducing safety risks
Caso 2: Safety System for Food Packaging Machinery
Solicitud: Safety gate monitoring for filling and capping machines with Schmersal BNS magnetic safety switches
Configuración: SRB301MC-24V monitors 2 safety gates; cross-wire detection prevents cable failures
Efecto: Complies with food industry safety standards and improves equipment reliability
Caso 3: Stackers in Automated Warehouse
Solicitud: Safety gate monitoring and emergency stop system for stacker aisles
Configuración: SRB301MC-24V connected to magnetic safety switches and E-stop buttons; signal output linked to PLC
Efecto: Stacker is locked when safety gates are open, upgrading warehouse safety level
Detailed Application Cases of Schmersal SRB301MC-24V Safety Relay
This model is optimized for magnetic safety switches, dual-channel monitoring and cross-wire detection, compliant with PL e / Categoría 4. It is widely used for safety gates, emergency stops and safety light curtains. Below are practical industry cases including wiring schemes, operation methods and application values.
- Machine Tool Industry (Aplicación principal)
Caso 1: Safety Gate & E-Stop Interlock for CNC Punch Press / Press Brake
- Dispositivos coincidentes: Schmersal BNS magnetic safety switches (machine protective gates) + Mushroom-head emergency stop buttons
- Operación:
Adopt dual-channel input and cross-wire detection to monitor front and rear protective gates;
Safety contacts open immediately when gates are opened or E-stop is triggered, executing STOP 0 instant shutdown;
Auxiliary signal contacts connect to PLC for gate status and fault alarm upload.
- Valor: Prevent personnel from accessing stamping hazardous areas; detect cable breakage and short circuit to avoid safety failure.
Caso 2: Rotating Hatch Monitoring for Machining Centers
- Dispositivos coincidentes: BNS magnetic safety switches (rotating protective gates)
- Operación: Switchable single/dual channel; equipment cannot start if gates are not fully closed; power circuit cuts off immediately if gates are opened during operation.
- Equipo aplicable: Vertical machining centers, drilling & fresadoras, muelas.
- Líneas de producción de automatización & Robotics
Caso 1: Safety Fence Monitoring for Robot Workcells
- Dispositivos coincidentes: Magnetic safety switches (fence access gates) + Safety light curtains
- Operación:
Signals from safety gates and light curtains are wired in series to the relay;
Robot stops and locks when personnel intrude or gates are opened; on-site reset is required for restart.
- Escenarios típicos: Automotive component handling, welding robots, loading/unloading robot cells.
Caso 2: Centralized Emergency Stop Control for Production Lines
- Operación: Emergency stop buttons at multiple workstations are connected in parallel to the module, cutting off power of motors and conveyors via unified safety circuit.
- Ventajas: Fast response and powerful circuit diagnosis, ideal for full-line safety interlock.
- Embalaje, Alimento & Pharmaceutical Machinery
Caso 1: Guard Safety Protection for Automatic Filling & Sealing Machines
- Dispositivos coincidentes: BNS non-contact magnetic safety switches (movable machine guards)
- Operación:
Frequent opening/closing of guards in food equipment leads to no mechanical wear for magnetic switches and longer service life;
Enable cross-wire detection to avoid safety hazards caused by aging and short-circuited cables in humid environments.
- Equipo aplicable: Beverage fillers, daily chemical packaging machines, pharmaceutical blister packaging machines.
Caso 2: Access Gate Interlock for Carton Packaging & Palletizing Machines
Magnetic switches are installed on equipment access gates. The palletizing mechanism and conveyors lock completely once gates are opened, protecting maintenance personnel.
- Logística & Warehousing Equipment
Caso 1: Aisle Safety Gate Monitoring for Warehouse Stackers
- Monitoring Points: Protective gates and access gates of stacker travel aisles
- Lógica: Stacker is disabled for travelling and lifting when gates are open; immediate shutdown and alarm during operation.
- Característica: Cross-wire detection effectively diagnoses faults of long-distance cables in warehousing systems.
Caso 2: Zone Safety Protection for Belt / Roller Conveyors
Access gates on both sides of conveyors and line-mounted E-stop buttons are connected to the module, realizing full-section emergency stop. Widely used in express sorting and material conveying lines.
- Rubber, Plástico & Injection Molding Machinery
Caso: Safety Gate & Mold Area Protection for Injection Molding Machines
- Dispositivos coincidentes: Magnetic safety switches (frente & rear safety gates of injection machines)
- Operación: Mold opening and part picking areas are high-risk zones. Mold closing action is locked when gates are opened to prevent pinching accidents. Complies with national safety standards for rubber & plastic machinery.
- General Auxiliary Applications (Equipo pequeño & Control Cabinets)
Caso: Small Automated Tooling & Test Equipment
For various custom assembly and test tooling, this relay builds cost-effective high-level safety circuits (Categoría 4 / pl y) with single E-stop and simple protective gates, suitable for small and medium-sized custom equipment.
Supplementary Operation Notes
- For optimal performance, use with Schmersal BNS magnetic safety switches (original manufacturer recommended combination).
- Enable cross-wire detection for long-distance wiring, humid or dusty sites.
- All above applications meet EN ISO 13849 PL e and Category 4, acceptable for equipment exported to the EU.
- Not recommended for outdoor, highly corrosive or severe vibration environments. IP40 rating is only for indoor control cabinet installation.
