ABB 3HAC0977-1 Resistor 10 Ohm 50W

ABB 3HAC0977-1 Resistor 10 Ohm 50W

1、 Product Overview

ABB 3HAC0977-1 is a high-power fixed resistor designed specifically for industrial automation systems and is a core component of ABB's industrial control product line. Its rated resistance is 10 Ω, with a power capacity of 50W. It adopts aluminum shell packaging and forced heat dissipation design, suitable for harsh environments with high loads and continuous operation. This product is mainly used in scenarios such as energy absorption, braking control, load testing, and circuit protection. It is commonly found in robots, servo drives, elevator control systems, and industrial power supplies.

2、 Brand background

ABB is a globally leading industrial automation and power technology group headquartered in Zurich, Switzerland. Established in 1988, it was formed by the merger of ASEA from Sweden and BBC Brown Boveri from Switzerland. ABB has over 130 years of history in the fields of power transmission, robotics technology, and industrial automation. Its products are renowned for their high reliability, precision control, and energy efficiency and environmental protection. In China, ABB has participated in national key projects such as the Three Gorges Project and the Qinghai Tibet Railway, and has research and production bases in Shanghai, Beijing, Guangzhou, and other places.

3、 Specification parameters

Parameter details

Model 3HAC0977-1

Resistance of 10 Ω (tolerance ± 5%, optional high-precision version ± 1%)

Rated power 50W (ambient temperature of 25 ° C), derating curve: 35W at 70 ° C, 0W at 125 ° C

Temperature coefficient ± 200ppm/° C (-55 ° C~+175 ° C)

Voltage withstand up to 500V DC/AC effective value

Temperature range -55 ° C~+175 ° C (storage temperature), -40 ° C~+125 ° C (operating temperature)

Packaging form: Aluminum shell packaging (IP00, optional IP20 protection level)

Installation method: rail installation or bolt fixation (M4 screws)

Cooling method: natural convection or forced air cooling (requires the use of cooling fins)

Certified CE, UL, RoHS

4、 Core functions

energy absorption

Used for energy release during servo motor or robot braking to prevent voltage spikes from damaging the drive. For example, in an elevator control system, when the motor stops, regenerative energy is consumed through this resistor to achieve smooth braking.

Current limiting and voltage divider

As a current limiting component in power circuits to protect sensitive electronic devices; Or provide precise voltage ratios in the voltage divider circuit to ensure stable control signals.

Load Testing

As a dummy load used for performance testing of power sources or inverters, it simulates power consumption under real working conditions.

EMC filtering

Combined with capacitors to form an RC filtering network, it suppresses high-frequency interference and improves the system's anti-interference ability.

5、 Working principle

This resistor operates based on Joule's law: when current passes through the resistor, electrical energy is converted into thermal energy（P=I two×R）. 

The aluminum shell packaging design achieves efficient heat dissipation through the following methods:

Material characteristics: The thermal conductivity of aluminum is as high as 237W/(m · K), which can quickly conduct heat from the resistance wire to the shell.

Structural design: The shell surface usually has heat dissipation fins to increase the heat dissipation area; Internally filled with thermal conductive silicone to reduce thermal resistance.

Thermal management: When the temperature exceeds the rated value, the power automatically decreases to ensure safe operation.

6、 Key advantages

high reliability

Adopting winding technology, it has strong resistance to impact current (up to 3 times the rated current), and MTBF (mean time between failures) exceeds 100000 hours.

Precision control

The low temperature coefficient (± 200ppm/° C) ensures stable resistance over a wide temperature range, making it suitable for precision control circuits.

Compactness

The volume is 20% smaller than similar products, with high power density, saving control cabinet space.

Easy to integrate

Support standard rail installation, compatible with ABB and third-party control systems, reducing installation costs.

7、 Precautions

Heat dissipation requirements

Keep the surrounding air circulating, it is recommended to reserve ≥ 50mm of heat dissipation space during installation; When forced air cooling, it is necessary to ensure that the wind speed is ≥ 2m/s.

voltage limit

The actual application voltage should not exceed the rated withstand voltage (500V), otherwise it may cause arc breakdown.

temperature monitoring

When operating at full load for a long time, it is recommended to use a temperature sensor to monitor the resistance temperature and avoid overheating.

installation direction

Vertical installation has a 15% higher heat dissipation efficiency than horizontal installation, and it is recommended to use it vertically.

8、 Similar model supplement

Model, Resistance, Power, Temperature Coefficient, Application Scenarios

3HAC0976-1 5 Ω 50W ± 200ppm/° C low resistance high current braking

3HAC0978-1 20 Ω 50W ± 200ppm/° C Medium Resistance Energy Absorption

3HAC0977-2 10 Ω 100W ± 150ppm/° C Higher power demand, no need to increase volume

3HAC0979-1 10 Ω 50W ± 50ppm/° C high-precision measurement circuit, with extremely high temperature stability requirements

9、 Application scenarios

industrial robot

Used for the braking circuit of robot joint servo motors, absorbing braking energy and protecting the driver.

Elevators and lifting equipment

As an energy consuming braking resistor in the elevator control system, it achieves fast start stop of the motor.

Uninterruptible Power Supply (UPS)

During the testing phase, as a load component, verify the stability of UPS output.

New energy equipment

Used for soft start current limiting in photovoltaic inverters to prevent device damage from surge currents.

test and measurement

As a standard load in the laboratory, it is used for power supply and battery charging and discharging tests.