Allen Bradley 1336-PB-SP6C 74101-181-51 Overload Relay

The 1336-PB-SP6C (also designated as 74101-181-51) is a specialized overload relay designed for integration with the 1336 series drive assemblies and related motor control equipment.
Its primary role is to safeguard motors from excessive current, thermal overload, and abnormal operating conditions by providing rapid detection and protective response.

Engineered for manufacturing environments where motors operate under fluctuating loads-such as conveyors, compressors, pumps, mixers, and automated machinery-the 1336-PB-SP6C ensures long-term reliability by preventing overheating, insulation breakdown, and motor failure.

Its compact assembly, reinforced construction, and stable trip characteristics make it a preferred replacement part for maintenance teams working on legacy Allen-Bradley drive systems.

-Motor-driven conveyor systems

-Pump stations (water, chemical, fluid transfer)

-Factory automation lines

-Air handling and ventilation systems

-Mixing and blending machinery

-Packaging machines

-Compressors and industrial blowers

The 1336-PB-SP6C is a vital protective element within motor-driven installations, performing:

-Continuous monitoring of current levels

-Fast overload trip response during abnormal increases in load

-Prevention of motor overheating and excessive thermal rise

-Protection of windings and insulation from long-term stress

-Mitigation of costly unplanned downtime

-Support for drive performance by maintaining proper motor load profiles

The relay ensures that motors operate within their designed capacities by reacting before critical damage occurs.

✔ Precise Overload Detection
Built for dependable trip curves suitable for industrial motors.

✔ Robust Build for Demanding Environments
Handles heat, vibration, and electrical interference common in factories.

✔ Compact Replacement Design
Engineered as a direct fit for 1336 drive systems.

✔ Consistent Trip Performance
Ensures predictable behavior under varying operational loads.

✔ Increased Motor Life
Prevents excessive thermal stress and mechanical wear.

✔ Suitable for Legacy Equipment
Supports older installations where original parts are difficult to source.

✔ Low Maintenance
Requires minimal service beyond inspection and occasional cleaning.

◇ Protects motors from premature wear
◇ Minimizes downtime from overload events
◇ Suitable for both heavy-duty and continuous-duty motors
◇ Extends the lifespan of drive assemblies
◇ Reduces unscheduled maintenance
◇ Improves overall system stability

Common Problem

What does the 1336-PB-SP6C overload relay protect?

It safeguards motors from excessive current and thermal damage.

Is it compatible only with the 1336 drive series?

Primarily yes, although some systems using compatible architecture may also support it.

How do I know if this relay fits my cabinet?

Match your module code and drive model with 1336-PB-SP6C / 74101-181-51.

Can it be used for high-load industrial motors?

Yes, provided the current range meets the motor's specifications.

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