Safety Relay Module DSMB137

Product Overview

The DSMB137 is a high-reliability safety relay module designed to serve as a critical component in industrial safety systems, enabling precise monitoring and control of safety interlocks in high-risk environments. As a key building block for safety instrumented systems (SIS), the DSMB137 processes input signals from emergency stops, light curtains, and safety gates, triggering immediate protective actions to halt hazardous operations when unsafe conditions are detected. With a focus on fail-safety and compliance, the DSMB137 meets stringent standards such as EN 61508 (SIL 2) and EN ISO 13849-1 (PL d), making it suitable for applications in automotive manufacturing, packaging machinery, and material handling. Whether integrated into machine guarding systems or production line safety loops, the DSMB137 stands out for its compact design, fast response time, and seamless compatibility with existing safety controllers.

Technical Specifications

Parameter	Value
Product Model	DSMB137
Manufacturer
Product Type	Safety Relay Module
Safety Rating	SIL 2 (EN 61508), PL d (EN ISO 13849-1)
Inputs/Outputs	4 safety inputs (24 VDC), 2 safety outputs (NO/NC contacts)
Response Time	< 50 ms
Operating Temperature	-10°C to 55°C (14°F to 131°F)
Power Supply	24 VDC ±15%
Power Consumption	< 3 W
Dimensions	17.5 x 100 x 60 mm (0.69 x 3.94 x 2.36 inches)

Key Features and Benefits

The DSMB137 is engineered to deliver robust safety performance in a compact form factor, making it ideal for space-constrained industrial environments. Its 4 safety inputs accept signals from a variety of safety devices, including emergency stop buttons and interlock switches, while the 2 dual-channel safety outputs (NO/NC) ensure reliable control of machine stopping circuits. This configuration allows for flexible integration into both simple and complex safety loops, providing a cost-effective solution for small to medium-sized machinery.

Speed is a critical advantage of the DSMB137, with a response time of less than 50 ms ensuring that hazardous conditions are addressed before they can cause harm. The module’s fail-safe design ensures that outputs de-energize in the event of internal faults, such as power loss or component failure, preventing unsafe states—a key requirement for SIL 2 and PL d compliance. This intrinsic safety eliminates the need for additional monitoring devices, reducing system complexity and cost.

Compliance is embedded in the DSMB137’s design, with certifications to global safety standards that simplify regulatory approval across regions. It meets EN 61508 (SIL 2) for electrical safety and EN ISO 13849-1 (PL d) for machinery safety, ensuring compatibility with safety systems in Europe, North America, and Asia. This global compliance makes the DSMB137 a versatile choice for multinational manufacturers, avoiding the need for region-specific components.

Ease of installation and maintenance sets the DSMB137 apart. Its DIN rail mounting design allows for quick integration into control panels, while clearly labeled terminals simplify wiring. The module includes status LEDs for inputs, outputs, and power, providing instant visual feedback for troubleshooting—reducing downtime during system checks or fault resolution. Unlike complex safety controllers, the DSMB137 requires no programming, with dip switches for setting parameters like reset mode (manual/automatic) and input configuration, making it accessible to technicians with basic safety training.

Reliability is ensured by the DSMB137’s rugged construction, which withstands the vibrations and temperature fluctuations common in industrial settings. Its wide power supply range (24 VDC ±15%) tolerates voltage variations, ensuring stable operation in environments with inconsistent power. The module’s long operational lifespan, paired with a low power consumption of less than 3 W, minimizes energy costs and reduces the need for frequent replacements.

Backed by a one-year warranty and expert pre-sales support to verify compatibility with safety devices, the DSMB137 offers a dependable, user-friendly solution for protecting personnel and equipment in industrial machinery.

Related Models

DSMB138 – SIL 3/PL e-rated upgrade of the DSMB137 with enhanced redundancy, suitable for high-risk applications requiring higher safety integrity.

DSMB136 – Compact variant with 2 safety inputs, a cost-effective alternative to the DSMB137 for simple safety loops (e.g., single emergency stop).

DSMB137-EX – Explosion-proof version certified for ATEX Zone 2, designed for installation in hazardous areas, compatible with the DSMB137 in mixed environments.

DSMB137-COM – Communication-enabled model with Modbus RTU, allowing remote monitoring of safety status, expanding the DSMB137’s capabilities for networked systems.

DSMB140 – Multi-channel module with 8 inputs/4 outputs, ideal for scaling safety systems alongside the DSMB137 in larger machinery.

DSMB137-T – Temperature-resistant variant operating up to 70°C (158°F), tailored for high-heat environments like foundries, building on the DSMB137’s durability.

As a trusted distributor, we provide expert pre-sales consultation to ensure the DSMB137 aligns with your safety loop requirements, including compatibility checks with existing safety devices. Our after-sales support includes installation guidance and troubleshooting assistance. All products, including the DSMB137, come with a one-year warranty. If you need a specific model not listed, contact us via [WhatsApp](https://wa.me/+86 19389860630) or email at jllucky33@qq.com for personalized assistance.