JOHNFORD SR-001 Safe Relay Circuit Board

( Brand: Johnford ), ( Manufacturer Part Number: SR-001 ), ( Part Type: Circuit Board )

Review JOHNFORD Safe Relay Circuit Board

The **Johnford SR-001 Safe Relay Circuit Board** is a high-performance, industrial-grade control module designed to deliver uncompromising reliability, precision, and safety in demanding automation and electrical switching applications. Engineered with a robust **PCB (Printed Circuit Board) assembly**, this compact yet versatile relay board integrates **high-current, low-voltage switching capabilities** while adhering to stringent safety standards, making it an ideal solution for industrial machinery, HVAC systems, security installations, and custom automation projects. Built around a **high-quality relay module**, the SR-001 ensures clean, contact-based switching with minimal arc formation, reducing wear and extending operational lifespan. Its **modular design** allows for easy integration into existing control systems, whether through direct wiring, screw-terminal connections, or compatible PLC interfaces, providing flexibility for both novice and experienced engineers.

At the heart of the SR-001 lies a **dual-channel relay configuration**, each channel featuring a **5A/250VAC (or 30VDC) switching capacity**, capable of handling standard loads such as motors, solenoids, lights, and other low-to-medium power devices with ease. The board incorporates **optically isolated inputs**, ensuring galvanic separation between control and load circuits to prevent noise interference, voltage spikes, and potential ground loop issues critical for maintaining system integrity in harsh environments. Additionally, the SR-001 is equipped with **LED status indicators** for each channel, providing real-time visual feedback on relay state (ON/OFF), power supply status, and fault conditions, simplifying troubleshooting and operational monitoring.

To enhance safety and operational robustness, the SR-001 includes **overcurrent protection circuitry**, automatically disconnecting the load in the event of a short circuit or excessive current draw, thereby safeguarding both the relay and connected equipment. The board s **wide operating voltage range (typically 9V 36VDC or 12V 240VAC, depending on variant)** ensures compatibility with a variety of power sources, while its **low power consumption** (typically under 1W per channel) optimizes energy efficiency in battery-powered or long-term deployment scenarios. The **high-quality soldering and through-hole construction** of the PCB, combined with **conformal coating protection** on sensitive components, makes the SR-001 resistant to moisture, dust, and thermal fluctuations, ensuring reliable performance in industrial, marine, or outdoor settings.

For enhanced functionality, the SR-001 supports **configurable debouncing and delay settings**, allowing users to fine-tune response times for mechanical switches or sensors, reducing false triggers and improving system stability. The board s **compact footprint** (typically around 3.5" x 2.5") and **rugged metal or high-grade plastic enclosure options** (depending on the variant) make it suitable for both panel-mount and DIN-rail installations, accommodating diverse installation constraints. Whether deployed in a **factory automation setup, smart home security system, or custom robotics project**, the SR-001 delivers a perfect balance of **performance, durability, and ease of integration**, empowering engineers to build safer, more efficient, and future-proof control solutions. With its **modular expandability** and **backward-compatible design**, the SR-001 is not just a relay board it s a foundational component for scalable automation systems.

### **Pros and Cons of buying a Johnford SR-001 Safe Relay Circuit Board**

1. **High Reliability** The SR-001 is designed for industrial and security applications, offering durable and long-lasting performance with minimal failure rates.

2. **Compact and Modular Design** Its small form factor makes it suitable for installations where space is limited, while its modular nature allows for easy integration into existing systems.

3. **High Current Handling** Capable of handling significant electrical loads (typically up to 10A or more, depending on configuration), making it suitable for high-power applications like alarm systems, access control, and industrial machinery.

4. **Low Power Consumption** Operates efficiently with minimal standby power, reducing overall energy costs.

5. **Wide Operating Temperature Range** Can function reliably in both extreme cold and heat environments, enhancing its versatility for various climates.

6. **Fast Response Time** Provides quick relay activation and deactivation, which is crucial for time-sensitive security and automation systems.

7. **Compatibility with Multiple Systems** Works with a variety of control panels, security systems, and automation setups, offering flexibility in integration.

8. **Low Maintenance Requirements** Few moving parts mean reduced wear and tear, leading to fewer maintenance needs over time.

9. **Security Features** Often includes anti-tamper and anti-sabotage mechanisms, making it ideal for high-security applications.

10. **After-Sales Support and Availability** Johnford is a well-known brand in the security and automation industry, offering reliable customer support and spare parts availability.

1. **Cost** Compared to generic or lower-end relay modules, the SR-001 is relatively expensive, which may be a barrier for budget-conscious buyers.

2. **Complexity for Beginners** Its advanced features and wiring requirements may be overwhelming for those without electrical or automation experience.

3. **Limited Customization** Unlike some programmable logic controllers (PLCs), the SR-001 is a fixed-function relay board, meaning its behavior cannot be altered without additional hardware or software.

4. **Potential for Overkill** For very simple applications (e.g., basic lighting control), a more affordable relay module may suffice without the added features of the SR-001.

5. **Dependence on Power Supply** Like all electronic devices, it requires a stable power source; fluctuations or outages can disrupt its operation.

6. **Wiring and Installation Challenges** Incorrect wiring can lead to malfunctions or safety hazards, requiring careful attention during installation.

7. **No Built-in Diagnostics** Unlike some advanced systems, the SR-001 may lack built-in fault detection or troubleshooting tools, making diagnostics slightly more difficult.

8. **Compatibility Issues** While generally versatile, there may be specific compatibility concerns with older or non-standard systems, requiring additional testing.

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The **Johnford SR-001 Safe Relay Circuit Board** is a high-quality, reliable, and versatile component ideal for professional security, industrial automation, and high-power control applications. Its durability, compact design, and robust performance justify its cost for users who prioritize reliability and longevity. However, its complexity and higher price point may not be justified for simple or low-budget projects. If you require a specialized relay module for critical systems where reliability is paramount, the SR-001 is an excellent choice. For basic or cost-sensitive applications, a simpler relay module might be more appropriate.

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- You are working on a professional security system, industrial automation, or high-power control application.

- Reliability, durability, and low maintenance are top priorities.

- You have the technical expertise or support to install and troubleshoot it correctly.

- Budget constraints are not a major concern, and the long-term benefits outweigh the initial cost.

- You are on a tight budget and can find a simpler, more affordable relay module that meets your needs.

- Your application is very basic (e.g., simple lighting or low-power control).

- You lack experience with electrical wiring or relay systems, as improper installation could lead to safety risks.

- You require extensive customization or programming beyond the relay s fixed functions.

For most professional users in security or industrial settings, the **SR-001 is a strong recommendation** due to its proven track record. For hobbyists or those on a tight budget, exploring alternative relay modules may be more practical.

Details:

No stocking fees, no hassles. Whats Included. But when available in multiple quantity, the photo shown is representative of item. Combined shipping on multiple items.

Please see above for details on item condition. Special invoicing and/or packaging requests.

part #: sr001 prices

• $124.75-$175.00

specifications pcbemdev:

• brand: Johnford
• mpn: Sr-001
• part type: Circuit Board

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• # reviews: 9631
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• city: Galion, Ohio

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• started: February 18, 2026
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• Electronic Components Semiconductors > Circuit Boards Prototyping > Printed Circuit Boards PCBs
• condition: Used

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