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STEARNS

STEARNS is a brand historically associated with electromagnetic clutches, brakes, and combined clutch-brake units for industrial motion control. The product line supplied by 3G Electric focuses on spring-set holding brake (ERS) combined clutch and brake units designed for C-face motors. These units are used to hold and stop loads in applications where a motor must be disengaged from the driven load and then braked, or where a load must be held in position when power is removed. The STEARNS ERS design uses a spring-set mechanism, meaning the brake engages when power is removed, providing fail-safe holding. Units in the 3G Electric catalog operate at 115/230V AC or 230/460V AC, with a 5/8 in bore size. They are available with totally enclosed or totally enclosed wash down enclosures, making them suitable for environments where dust, moisture, or washdown cleaning is present. Mounting is direct to C-face motors, with compatibility noted for motor frames such as 143TC and NEMA 2. Some variants mount on a reducer. The combined clutch and brake function allows a single unit to both disengage the motor from the load and apply braking, which can simplify machine design compared to separate clutch and brake components. 3G Electric supplies these STEARNS units as part of its industrial equipment distribution line. The catalog includes multiple SKUs with variations in voltage, enclosure type, and mounting configuration. Buyers can compare specifications such as AC voltage, bore size, enclosure rating, and motor frame compatibility. 3G Electric provides logistics support and quotation services for these products, shipping globally. The STEARNS line is relevant to plant engineers and maintenance managers specifying motion control for conveyors, packaging machinery, material handling, and other applications requiring reliable holding or stopping of loads. The spring-set holding brake design is a standard approach for fail-safe braking, and the wash down enclosure option extends use into food processing, pharmaceutical, and other washdown-intensive environments. When selecting a STEARNS combined clutch and brake unit, key considerations include the motor frame size, the available AC voltage, the required bore size, and the enclosure type needed for the operating environment. The 5/8 in bore size is common across the listed SKUs, and the voltage options cover both single-phase and three-phase supply configurations. The totally enclosed wash down enclosure provides additional protection against ingress of water and cleaning agents. 3G Electric maintains inventory and can source specific SKUs based on application requirements. For technical buyers, the STEARNS product family offers a compact, integrated solution for clutch and brake functions on C-face motors, with a design that engages the brake when power is removed. This is a safety-relevant characteristic in many industrial settings. The units are intended for direct mounting to C-face motors, which simplifies alignment and installation. The availability of multiple voltage and enclosure options allows matching to specific power supplies and environmental conditions. 3G Electric supports the line with product data, quotation, and global shipping.

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About STEARNS

STEARNS is a brand historically associated with electromagnetic clutches, brakes, and combined clutch-brake units for industrial motion control. The product line supplied by 3G Electric focuses on spring-set holding brake (ERS) combined clutch and brake units designed for C-face motors. These units are used to hold and stop loads in applications where a motor must be disengaged from the driven load and then braked, or where a load must be held in position when power is removed. The STEARNS ERS design uses a spring-set mechanism, meaning the brake engages when power is removed, providing fail-safe holding. Units in the 3G Electric catalog operate at 115/230V AC or 230/460V AC, with a 5/8 in bore size. They are available with totally enclosed or totally enclosed wash down enclosures, making them suitable for environments where dust, moisture, or washdown cleaning is present. Mounting is direct to C-face motors, with compatibility noted for motor frames such as 143TC and NEMA 2. Some variants mount on a reducer. The combined clutch and brake function allows a single unit to both disengage the motor from the load and apply braking, which can simplify machine design compared to separate clutch and brake components. 3G Electric supplies these STEARNS units as part of its industrial equipment distribution line. The catalog includes multiple SKUs with variations in voltage, enclosure type, and mounting configuration. Buyers can compare specifications such as AC voltage, bore size, enclosure rating, and motor frame compatibility. 3G Electric provides logistics support and quotation services for these products, shipping globally. The STEARNS line is relevant to plant engineers and maintenance managers specifying motion control for conveyors, packaging machinery, material handling, and other applications requiring reliable holding or stopping of loads. The spring-set holding brake design is a standard approach for fail-safe braking, and the wash down enclosure option extends use into food processing, pharmaceutical, and other washdown-intensive environments. When selecting a STEARNS combined clutch and brake unit, key considerations include the motor frame size, the available AC voltage, the required bore size, and the enclosure type needed for the operating environment. The 5/8 in bore size is common across the listed SKUs, and the voltage options cover both single-phase and three-phase supply configurations. The totally enclosed wash down enclosure provides additional protection against ingress of water and cleaning agents. 3G Electric maintains inventory and can source specific SKUs based on application requirements. For technical buyers, the STEARNS product family offers a compact, integrated solution for clutch and brake functions on C-face motors, with a design that engages the brake when power is removed. This is a safety-relevant characteristic in many industrial settings. The units are intended for direct mounting to C-face motors, which simplifies alignment and installation. The availability of multiple voltage and enclosure options allows matching to specific power supplies and environmental conditions. 3G Electric supports the line with product data, quotation, and global shipping.

Common Applications

  • Food and beverage processing — STEARNS ERS combined clutch and brake units with totally enclosed wash down enclosures for conveyors and packaging equipment exposed to washdown cleaning.
  • Material handling — STEARNS spring-set holding brake units for holding loads on inclined conveyors or indexing tables when power is removed.
  • Packaging machinery — STEARNS combined clutch and brake units for C-face motors to stop and hold packaging axes during cycle interruptions.
  • Pharmaceutical manufacturing — STEARNS wash down enclosure units for equipment requiring frequent cleaning and fail-safe holding of loads.
  • Industrial automation — STEARNS ERS units for motor disengagement and braking on C-face motors in assembly or processing lines.
  • Reducer-mounted applications — STEARNS combined clutch and brake units that mount on a reducer for space-constrained drive trains.

Frequently asked questions

Common questions about STEARNS from 3G Electric.

What is the operating voltage range for STEARNS combined clutch and brake units?

STEARNS combined clutch and brake units in the 3G Electric catalog operate at either 115/230V AC or 230/460V AC. The specific voltage depends on the SKU. For example, SKU 879YW8 and SKU 879YW6 are rated 115/230V AC, while SKU 879YX2 and SKU 879YW7 are rated 230/460V AC. The dual voltage ratings indicate the units can be wired for either of the two listed voltages, which allows flexibility in matching the available power supply. Always confirm the voltage rating on the nameplate and verify compatibility with the motor and control circuit before installation.

What does the ERS designation mean on STEARNS clutch and brake units?

ERS stands for spring-set holding brake. In this design, a spring applies the braking force when power is removed from the unit. This is a fail-safe configuration: if power is lost, the brake engages and holds the load. The clutch function allows the motor to be disengaged from the load during operation. The combined unit integrates both functions in a single assembly that mounts to a C-face motor. This arrangement is used in applications where a load must be held or stopped when the motor is de-energized, such as on conveyors, packaging equipment, or material handling systems.

What motor frames are compatible with STEARNS combined clutch and brake units?

The STEARNS combined clutch and brake units listed by 3G Electric are designed for C-face motors. Specific SKUs reference motor frame 143TC, and one SKU (879YX0) references NEMA 2 frame designation. Some units mount directly to the motor, while others mount on a reducer. The 5/8 in bore size is consistent across the listed SKUs. When selecting a unit, verify the motor frame size and mounting configuration to ensure compatibility. The C-face mounting provides a standard interface, but the frame size and bore must match the motor shaft and mounting flange.

What is the difference between totally enclosed and totally enclosed wash down enclosures on STEARNS units?

Totally enclosed enclosures protect the internal components from dust and contact. Totally enclosed wash down enclosures provide additional sealing to withstand washdown cleaning procedures, where water and cleaning agents may be sprayed onto equipment. In the STEARNS line, SKUs such as 879YW8, 879YW6, 879YX3, and 879YX1 are listed with totally enclosed wash down enclosures. Other SKUs, such as 879YW7, 879YX0, and 879YW4, are listed with totally enclosed enclosures. The choice depends on the environment: wash down enclosures are appropriate for food processing, pharmaceutical, or other areas where regular washdown occurs.

Can STEARNS combined clutch and brake units be used to hold loads when power is removed?

Yes. The spring-set holding brake (ERS) design is specifically intended to hold or stop loads when power is removed. The spring applies the brake, so the unit fails safe on power loss. This makes the STEARNS units suitable for applications where a load must not move when the motor is de-energized, such as holding a conveyor in position on an incline or preventing a load from dropping. The clutch function allows the motor to be disengaged from the load during normal operation. The combined unit provides both functions in one assembly, simplifying the drive train.

What bore size do STEARNS combined clutch and brake units use?

The STEARNS combined clutch and brake units in the 3G Electric catalog have a 5/8 in bore size. This is consistent across the listed SKUs, including 879YW8, 879YW6, 879YX2, 879YX3, 879YW7, 879YX0, 879YW4, and 879YX1. The bore size must match the motor shaft diameter for proper mounting and torque transmission. If a different bore size is required, consult 3G Electric for availability of other STEARNS models. The 5/8 in bore is a common size for C-face motors in the 143TC frame range.