Techtop Motors GR3-CI-TF-256TC-2-BR-D-20 TechTop GR3-CI-TF-256TC-2-BR-D-20 — 20 HP (GR3) Three Phase Cast Iron motor, 256TC…

Name: 20 HP TEFC Cast Iron Motor, 256TC Frame, 230/460V, 3550 RPM, IE3 Efficiency, UL/CSA Certified
Brand: Techtop Motors
SKU: GR3-CI-TF-256TC-2-BR-D-20
Availability: InStock

Documents & Media

3D CAD Model (STEP)Specification Sheet Manufacturer Product Website

Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The TechTop GR3-CI-TF-256TC-2-BR-D-20 is a 20 HP, three-phase, cast iron motor engineered for heavy-duty industrial applications. Built to NEMA Premium IE3 standards, this motor delivers 91% nominal efficiency, reducing energy consumption and operational costs compared to standard motors. The 256TC frame size ensures compatibility with a wide range of industrial machinery, while the Totally Enclosed Fan-Cooled (TEFC) enclosure provides robust protection against dust, moisture, and harsh environments. Designed for dual-voltage operation (230/460V, 60Hz or 50Hz), the GR3-CI-TF-256TC-2-BR-D-20 offers flexibility in global applications. Rated at 3550 RPM with a service factor of 1.25, it handles intermittent overloads without derating. The motor features a 12-lead dual-voltage wiring configuration, allowing easy reconfiguration for different voltage requirements. With a locked rotor torque of 187.1% of full load and a breakdown torque of 302%, it ensures reliable starting and operation under varying load conditions. Certified to UL, CSA, and DOE standards, this motor meets Class 1, Division 2, Groups A-D hazardous location requirements, making it suitable for chemical, petrochemical, and grain processing facilities. The cast iron construction provides durability and vibration resistance, while the F-class insulation system ensures reliable operation in ambient temperatures up to 40°C. Bearings (6309 C3) on both drive-end and non-drive-end sides are pre-lubricated for extended service life. Its tropicalized design resists corrosion in humid or corrosive environments, and the removable feet simplify installation and maintenance. With a weight of 293 lbs and a moment of inertia of 0.28 kg·m², it balances performance with manageable handling.

20 HP, 3-phase, cast iron motor with 256TC frame size
Dual-voltage operation: 230/460V, 60Hz or 50Hz
Totally Enclosed Fan-Cooled (TEFC) enclosure for harsh environments
NEMA Premium IE3 efficiency rating (91% nominal)
Class 1, Division 2, Groups A-D hazardous location certified
12-lead dual-voltage wiring for flexible configuration
Service factor 1.25, locked rotor torque 187.1%, breakdown torque 302%
F-class insulation, tropicalized design for corrosion resistance
Bearings 6309 C3 on both drive-end and non-drive-end sides
Removable feet for simplified installation and maintenance

Specifications

2E	10 in
A	12.4 in
AA	1 1/4 in
AB	8.82 in
AJ	7.25 in
AK	12.5 in
BA	4.25 in
BB	0.25 in
BF	4 x 1/2 in
Connection Type	12-lead dual-voltage
D	6.25 in
E	5 in
ES	2.91 in
F1	10.25 in
F2	12 in
Frequency	50/60 Hz
H	0.83 in
IP Rating	IP55
Material	Cast Iron
Mounting Type	Foot-mounted
N-W	4 in
Nema Rating	NEMA Premium IE3
O	12.5 in
P	12.4 in
Poles	2
R	1.416 in
S	0.375 in
Series	GR3-CI-TF
Size	256TC
U	1.625 in
Voltage Rating	230/460 V

Frequently Asked Questions

What is the rated motor output power for this model?

The rated motor output power for the GR3-CI-TF-256TC-2-BR-D-20-230|460-60 is 20 HP.

What are the available rated motor voltages?

The rated motor voltage is 230V or 460-60V for 3-phase operation.

What is the frame size of this motor?

The frame size for this motor is 256.

What is the enclosure type and IP rating?

The enclosure type is TEFC (Totally Enclosed Fan Cooled) with an IP rating of 55.

What is the service factor and insulation class?

The service factor is 1.25 and the insulation class is F.

What is the nominal efficiency and power factor?

The nominal efficiency is 91% and the nominal power factor is 0.91 cosθ.

What is the full load torque in Ft-Lb?

The full load torque is 29.504 Ft-Lb.

What is the temperature rise at full load?

The temperature rise at full load is 52.2 °C.

What are the hazardous location classifications?

This motor is suitable for Class 1, Div 2, Grp A, B, C, D hazardous locations.

What is the approximate weight of the motor?

The approximate weight of the motor is 293 lbs.

Frequently Asked Questions about Techtop Motors

What certifications and standards do Techtop Motors products comply with?

Techtop Motors products comply with NEMA Premium® efficiency standards, IEEE 841 for severe duty applications, and MG1 Part 31 for safe VFD use. Additionally, they feature IP55 ingress protection and are constructed with corrosion-resistant materials, ensuring durability and reliability in industrial environments.

What is Techtop Motors's warranty policy?

Techtop Motors offers a 36-month warranty from the date of purchase on their electric motors, ensuring protection against defects in materials and workmanship. This warranty reflects Techtop's commitment to quality and customer satisfaction.

What industries and applications are Techtop Motors products used for?

Techtop Motors products are utilized across a wide range of industries, including manufacturing, processing, agriculture, HVAC, and heavy-duty applications. Their motors are designed for powering machinery such as pumps, fans, conveyors, and compressors, ensuring reliable performance and energy efficiency in demanding environments.

What technical support does Techtop Motors offer?

Techtop Motors offers comprehensive technical support, including pre-sale and post-sale assistance through a fully trained customer service team. Our support extends to application-driven engineering, ensuring that customers receive expert guidance tailored to their specific needs. Additionally, we provide access to live inventory, electrical and dimensional data, and downloadable brochures via our website.

What are the main product lines offered by Techtop Motors?

Techtop Motors offers a diverse range of industrial electric motors, including NEMA Premium Efficiency motors, IEEE 841 Severe Duty motors, JM/JP Pump motors, and Explosion Proof motors. Their product lines also feature options in both cast iron and aluminum constructions, as well as specialized motors for applications like cooling towers and washdown environments. With horsepower ratings ranging from 1/8 to 500 HP and various frame sizes, Techtop Motors is equipped to meet a wide array of industrial automation needs.

What are the key features of Techtop Motors products?

Techtop Motors products feature NEMA PREMIUM® operating efficiency, ensuring reduced energy costs and enhanced performance. They are designed with hand-inserted lap wound stators for smooth operation, true copper windings for reduced loss, and full cast iron construction for durability. Additional features include IP55 ingress protection, automatic moisture drainage, and a 36-month warranty, making them ideal for demanding industrial applications.

What communication protocols do Techtop Motors products support?

Techtop Motors products support a comprehensive range of communication protocols including PROFIBUS DP V1, PROFINET with dual port, EtherNet/IP with dual port, CANopen, and Modbus RTU integrated as standard. These protocols facilitate efficient communication and integration within industrial automation systems, enhancing system performance and diagnostics.

What environmental ratings do Techtop Motors products have?

Techtop Motors products feature environmental ratings such as IP55 and IP56, providing robust protection against dust and water ingress. These ratings ensure reliable performance in various industrial environments, with options for oil seals and labyrinth seals for enhanced durability.

What accessories are available for Techtop Motors products?

Techtop Motors offers a variety of accessories for their products, including C & D flanges for versatile mounting options, aluminum and rolled steel C-face conversion kits, and multi-mount removable mounting feet for easy installation. Additionally, their motors feature color-coded oversized lead wires for simplified connections and automatic grease purge systems to prevent over-greasing, enhancing maintenance efficiency.

How are Techtop Motors products typically installed?

Techtop Motors products are designed for straightforward installation, featuring multi-mount removable mounting feet that allow for easy repositioning of the conduit box. Their lightweight designs facilitate handling in difficult-to-reach locations, while color-coded oversized lead wires simplify electrical connections. Additionally, the motors are equipped with features such as automatic grease purge and double lip shaft seals, ensuring reliable operation and maintenance ease.