Reliance Electric T21T1308A-HG Heavy-Duty DC Motor
Overview
The Reliance Electric T21T1308A-HG is a robust industrial DC motor from the T21T series, engineered for heavy-duty, continuous-duty performance in harsh industrial environments. The “HG” designation denotes Heavy-Gauge construction, featuring upgraded mechanical components and reinforced windings for enhanced durability under high load, shock, and vibration conditions. Designed as a shunt-wound DC motor, it delivers consistent torque, precise speed regulation, and reliable long-term operation, serving as a trusted power source for process industries, material handling, and legacy automation systems.
Key Features
Heavy-Gauge (HG) Construction: Reinforced cast iron frame and heavy-duty shaft assembly provide exceptional resistance to mechanical shock, heavy vibration, and high-torque loads, ideal for demanding industrial cycles.
Upgraded Insulation System: Equipped with Class H insulation (180°C) as standard, delivering superior thermal stability and protecting windings from overheating during prolonged continuous or high-load operation.
Totally Enclosed Non-Ventilated (TENV) Enclosure: Sealed housing prevents dust, moisture, chemicals, and airborne contaminants from entering internal components, ensuring reliability in dirty, humid, or corrosive environments.
Precision Shunt-Wound Design: Optimized electrical architecture enables smooth torque delivery and precise speed control, compatible with Reliance SCR and PWM DC drives for accurate speed adjustment across a wide range.
Heavy-Duty Brush & Commutator Assembly: High-grade carbon brushes and a hardened commutator reduce wear, minimize sparking, and extend maintenance intervals, lowering operational downtime.
Integrated Thermal Protection: Built-in thermal sensors continuously monitor internal winding temperature, triggering overload protection to prevent burnout from excessive heat or electrical overload.
Standardized T21T Series Mounting: Foot-mounted configuration with industry-standard T21T frame dimensions, enabling straightforward drop-in installation and seamless replacement in existing systems.
Technical Specifications
Manufacturer: Reliance Electric
Model: T21T1308A-HG
Series: T21T (RPM III Heavy-Duty DC Motor Series)
Frame: B2112AT (Heavy-Gauge)
Power Rating: 10 HP (7.5 kW)
Armature Voltage: 500 VDC
Field Voltage: 300 VDC
Base Speed: 1750 RPM (field weakening up to 2400 RPM)
Insulation Class: Class H (180°C)
Enclosure: TENV (Totally Enclosed Non-Ventilated)
Mounting Type: Foot-mounted
Shaft Diameter: 1.375 in (34.93 mm)
Ambient Temperature Range: -10°C to +50°C (extended for HG rating)
Duty Cycle: Continuous
Weight: Approximately 240 lbs (109 kg)
Typical Applications
The T21T1308A-HG is purpose-built for industrial applications requiring heavy-load reliability and continuous operation. It excels in driving heavy-duty conveyors, hoists, cranes, and lifting equipment in material handling and logistics. It is widely used in chemical, plastic, rubber, and food processing plants to power mixers, agitators, pumps, and fans in high-temperature or corrosive environments. Additionally, it provides stable power for heavy machine tools, industrial presses, and automated production lines in manufacturing workshops, making it an ideal solution for legacy system upgrades and replacements.
Compatibility and Availability
This motor is fully compatible with Reliance Electric’s full line of DC drive systems, as well as most third-party industrial DC controllers and PLC units. Its standardized frame size, mounting dimensions, and electrical interfaces ensure seamless interchangeability with other T21T series models. While original production has been discontinued, available units include new old stock (NOS) and professionally refurbished motors. Refurbished units undergo full disassembly, component replacement, cleaning, and performance calibration to meet original factory specifications, with authorized suppliers typically offering standard warranty coverage.
Advantages
The T21T1308A-HG combines heavy-gauge mechanical construction with high-grade electrical components, delivering exceptional durability and reliability in the most demanding industrial environments. Its Class H insulation and TENV sealed design ensure consistent performance and long service life during round-the-clock operation. The precise speed control capabilities and drive compatibility simplify integration into existing systems, reducing installation and commissioning time. As a mature legacy motor model, it provides a cost-effective solution for maintaining and upgrading aging industrial equipment, avoiding the high costs of full system replacement while ensuring reliable production operations.
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