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Allen Bradley MSR138DP Motor Protection Relay with Differential Protection

Allen Bradley MSR138DP Motor Protection Relay with differential protection.

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ManufacturerAllen Bradley

Part numberMSR138DP

Type Motor Protection Relay

Model MSR138DP

Manufacturer Allen Bradley

Protection Differential, Thermal Overload, Phase Imbalance

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12-month warranty

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Same-day dispatch

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Worldwide delivery

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Veteran-owned

CAGE: 9NK75

Differential protection Thermal overload protection Phase imbalance detection High-speed fault clearing Advanced diagnostics

Product description

The Allen Bradley MSR138DP is an advanced motor protection relay offering differential protection, alongside thermal overload and phase imbalance sensing. This high-level protection is crucial for critical motors where minimizing downtime and preventing catastrophic failure is essential. The relay provides precise fault detection and rapid response.

This relay is specifically utilized in high-value motor applications found in power generation, large industrial drives, critical pumping systems, and large fan applications. It is designed for environments where the cost of motor failure significantly outweighs the cost of advanced protection.

Stanlo Automation, a veteran-owned surplus parts distributor, is your go-to source for the Allen Bradley MSR138DP. We help you secure essential automation components at competitive prices, ensuring your critical assets are protected.

Technical specifications

Type	Motor Protection Relay
Model	MSR138DP
Manufacturer	Allen Bradley
Protection	Differential, Thermal Overload, Phase Imbalance
Reset	Manual

Common applications

Power generation

Critical industrial drives

Large pumping systems

Large fan applications

Petrochemical facilities

Heavy machinery

Compatible systems

Suitable for large motor applications and integration into complex protection schemes.

Also known as

MSR 138DP, Allen Bradley MSR 138DP, Motor differential relay

Replaces / compatible with

This relay is designed for advanced motor protection applications requiring differential sensing capabilities within the Allen Bradley MSR series.

Technical note

Expert tip

Proper installation of current transformers (CTs) for both motor leads is critical for the accurate operation of the MSR138DP's differential protection function.

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Frequently asked questions

What is differential protection and why is it used on the MSR138DP?

Differential protection on the MSR138DP compares the current entering and leaving the motor windings. If there's a significant difference, it indicates an internal winding fault, allowing for immediate trip to prevent catastrophic damage to the motor and connected equipment.