TOSHIBA R-150S Overload Relay JEM1356 600V RG22H

( Brand: Toshiba ), ( Manufacturer Part Number: R-150S ), ( Type: Overload Relay ), ( Country Of Origin: Japan )

Review TOSHIBA Overload Relay 600v Max

The **Toshiba R-150S Overload Relay (JEM1356, 600V, RG22H)** is a high-performance, thermally protected motor protection device designed to safeguard three-phase induction motors from excessive thermal stress, overload conditions, and potential damage due to prolonged overcurrent or stalled operation. Engineered with Toshiba s precision engineering, this overload relay combines robust mechanical durability with advanced thermal response technology to ensure reliable protection in industrial, commercial, and heavy-duty applications. The **JEM1356** model is specifically rated for **600V AC** operation, making it suitable for motors with power ratings ranging from a few horsepower up to several hundred, depending on the ambient temperature and motor specifications. Its **RG22H** designation indicates a compact yet sturdy construction, featuring a **22mm** mounting width and a **H-type** thermal element configuration, which optimizes space efficiency in control panels while maintaining high thermal sensitivity.

At its core, the R-150S operates on a **bimetallic thermal principle**, where a coiled bimetallic strip expands under heat generated by the motor s current flow, gradually opening the relay s contacts to disconnect the motor from the power supply when overload conditions are detected. This design ensures gradual and predictable tripping, preventing sudden surges that could damage sensitive equipment. The relay s **adjustable trip settings** allow for fine-tuning of the overload protection curve to match the specific thermal characteristics of the motor, accommodating variations in ambient temperature, motor efficiency, and duty cycles. This flexibility is particularly valuable in applications where motors operate under fluctuating loads, such as in HVAC systems, pumps, compressors, or conveyor belts, where consistent protection is critical for maintaining operational integrity and extending equipment lifespan.

One of the standout features of the Toshiba R-150S is its **high reliability and long service life**, achieved through the use of high-quality materials and a robust mechanical design. The relay s **sealed contacts** resist corrosion and arcing, ensuring consistent performance even in harsh environments, while its **thermal compensation** feature automatically adjusts the trip point based on ambient temperature variations, preventing false trips in hot or cold conditions. Additionally, the **quick-reset mechanism** allows for rapid re-engagement after a trip, minimizing downtime in continuous operation scenarios. The relay s **compact yet durable housing** is designed for easy installation in standard control panels, with a **screw-terminal connection** that ensures secure and stable electrical contacts, reducing the risk of loose connections or voltage drops.

Beyond its protective functions, the Toshiba R-150S overload relay is built to meet stringent industrial standards, including **IEC 60947-4-1** and **UL 508**, ensuring compliance with global safety and performance regulations. Its **600V AC rating** makes it versatile for a wide range of motor applications, from low-voltage industrial machinery to medium-voltage systems, while its **RG22H form factor** alignes with common control panel layouts, simplifying integration into existing electrical schematics. Whether used in new installations or as a replacement for aging protection devices, the R-150S offers a balance of **precision, durability, and ease of use**, making it an indispensable component for engineers and technicians seeking dependable motor protection in demanding environments.

**Pros and Cons of buying a Toshiba R-150S Overload Relay (JEM1356, 600V, RG22H)**

1. **Compatibility and Reliability** The Toshiba R-150S is a well-established model designed for industrial and commercial applications, particularly in motor protection circuits. It is widely used in HVAC systems, pumps, and other motor-driven equipment, ensuring compatibility with standard industrial setups.

2. **Adjustable Protection** This overload relay offers adjustable trip settings (typically for current and time delay), allowing for fine-tuning to match specific motor loads and environmental conditions. This flexibility helps prevent unnecessary shutdowns while ensuring motor safety.

3. **Durability and Build Quality** Toshiba is known for producing robust electrical components, and the R-150S is built to withstand harsh industrial environments. Its metal housing and sealed contacts contribute to longevity, reducing the risk of failure due to dust, moisture, or vibration.

4. **Easy Installation and Maintenance** The relay is designed for straightforward wiring and mounting, often featuring clear terminal markings and a compact form factor. Maintenance is minimal, primarily involving periodic inspection of contacts and adjustment of settings if needed.

5. **Overcurrent and Overload Protection** The device provides dual protection: overload protection (for sustained current) and short-circuit protection (via thermal or magnetic trip mechanisms), reducing the risk of motor damage from excessive heat or electrical faults.

6. **Compatibility with Motor Starters** It is frequently paired with Toshiba or compatible motor starters (e.g., JEM series), making it a seamless addition to existing control panels.

7. **Standardized Voltage Rating (600V)** The 600V rating ensures it can handle typical industrial voltage levels in North America and other regions, providing a broad range of application possibilities.

8. **Availability of Spare Parts** Due to its widespread use, replacement parts and accessories (e.g., fuses, terminals) are readily available, reducing downtime in case of component failure.

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1. **Age and Obsolescence** The R-150S is an older model (part of the JEM series), which means it may no longer be in Toshiba s active product line. This could lead to challenges in finding new units, technical support, or firmware updates in the future.

2. **Limited Digital Features** Unlike newer overload relays, the R-150S lacks advanced digital diagnostics, communication interfaces (e.g., Modbus), or programmable logic, which are beneficial for modern automation systems.

3. **Manual Adjustment Requirements** Setting trip curves and thresholds requires manual intervention, which can introduce human error if not done correctly. Digital relays often automate these processes.

4. **Potential Compatibility Issues with Modern Systems** If integrating with newer PLCs or SCADA systems, the R-150S may lack the necessary communication protocols or signal outputs, requiring additional converters or interfaces.

5. **Higher Long-Term Cost** While the upfront cost may be reasonable, the lack of long-term support or newer, more efficient models could lead to higher maintenance or replacement costs over time.

6. **Limited Environmental Ratings** Depending on the specific variant, the R-150S may not be rated for extreme conditions (e.g., high humidity, corrosive environments, or wide temperature ranges) without additional protection.

7. **Training and Expertise Dependency** Older models may require technicians with specific knowledge of analog protection systems, which could be less common in modern industrial settings.

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The Toshiba R-150S overload relay is a **reliable, durable, and cost-effective choice** for applications where compatibility with legacy systems, simplicity, and mechanical robustness are priorities. It excels in basic motor protection roles, particularly in environments where digital communication or advanced diagnostics are unnecessary. However, its **lack of modern features, potential obsolescence, and manual adjustment requirements** make it less ideal for cutting-edge automation or long-term investments.

For **new installations or systems requiring integration with digital controls**, a newer overload relay (e.g., from Toshiba s newer series, Schneider Electric, or Siemens) would offer superior flexibility and support. Conversely, the R-150S remains a **practical and proven solution** for maintaining existing setups where it is already in use.

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- You are replacing an existing R-150S or compatible relay in a well-established system.

- Your application does not require digital communication or advanced diagnostics.

- You prioritize mechanical reliability and simplicity over modern features.

- Spare parts and technical support are readily available in your region.

- You are starting a new project and need compatibility with PLCs, SCADA, or IoT systems.

- You require programmable or adjustable protection curves with digital interfaces.

- Long-term support, warranties, or future-proofing are critical concerns.

- Your environment demands higher environmental ratings (e.g., IP67, wide temperature ranges).

For most **new applications**, evaluating a newer overload relay (e.g., Toshiba s JEM2000 series, Schneider Electric s TE series, or Allen-Bradley s K series) would be advisable to ensure scalability and compatibility with modern industrial standards. However, the R-150S remains a **sound choice for maintenance or replacement in proven systems**.

Details:

Selling as used but I don't believe it has been. Thanks storage US. Please view pics.

part #: r150s prices

• $78.80-$95.00

specifications automationjack:

• brand: Toshiba
• mpn: R-150s
• type: Overload Relay
• country of origin: Japan

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• quantity: 1
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• started: May 17, 2026
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• condition: Used
• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

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