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175U3316 Danfoss

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Internal Product Review

The 175U3316 is a Danfoss VLT brake resistor with 3200 W continuous power and 56 Ω resistance. Dielectric strength rated at 2500 V AC for 1 minute and 39.9 kW pulse power at 10% duty make the resistor an excellent choice for dependable braking performance.

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Product Description:

The 175U3316 brake resistor is manufactured by Danfoss within the VLT Brake Resistors series. Designed for connection to VLT drives, the unit converts excess kinetic energy from a decelerating motor into heat so that the DC-link voltage stays within permitted limits during rapid braking or overhauling loads. By providing this thermal sink, the component protects the drive’s power semiconductors and allows automation equipment to stop or reverse without mechanical friction devices.

Under a steady load, the resistor can dissipate 3200 W; this continuous power rating indicates the thermal capacity that can be handled indefinitely when the housing remains within its normal temperature range. The element has a resistance of 56 Ω, which establishes the current drawn from the DC bus at a given voltage and determines the braking torque. Electrical connection is permitted up to 690 V AC or 1100 V DC, matching the maximum supply levels of standard high-power VLT inverters. A dielectric strength of 2500 V AC for one minute separates the resistor coil from its grounded enclosure and verifies insulation integrity during high-potential testing. Production tolerance is held to ±10%, ensuring predictable braking performance when multiple resistors are installed in parallel banks.

For intermittent duty cycles, the device may absorb pulses of 39.9 kW at a 10% duty cycle or 9.9 kW at a 40% duty cycle, enabling quick stops on conveyors, hoists, or centrifuges without exceeding the film temperature limit. A normally closed thermal switch opens at 180 °C so a drive controller can disable braking if the internal temperature approaches the design limit. The enclosure can reach up to 300 °C during severe regeneration, so installation clearances and wire insulation must accommodate that surface temperature. The switch contacts are rated for 2 A at 250 V AC and are wired with AWG 20 (0.5 mm²) leads for direct connection to the drive’s digital inputs.

Continuous Power
3200 W
Dielectric Strength
2500 V AC, 1 min
Insulation
>20 MΩ @ 1000 V
Maximum Housing Temp
300 °C
Operating Voltage (iec)
690 V AC / 1100 V DC
Pulse Power (10% Duty)
39.9 kW
Pulse Power (40% Duty)
9.9 kW
Resistance
56 Ω
Resistance Tolerance
±10%
Temp Switch Contact
Normally Closed (NC)
Temp Switch Enable Temp
180 °C
Temp Switch Rating
2 A, 250 V AC
Temp Switch Wire Gauge
AWG 20
Temp Switch Wire Size
0.5 mm²

Frequently Asked Questions about 175U3316:

Q: What is the continuous power rating of the 175U3316 brake resistor?

A: The Danfoss 175U3316 brake resistor has a continuous power rating of 3200 W.

Q: What are the maximum operating voltages supported by the 175U3316?

A: This model supports operating voltages up to 690 V AC or 1100 V DC according to IEC standards.

Q: What is the resistance value of the Danfoss 175U3316 resistor?

A: The resistance value of the 175U3316 is 56 ohms with a ±10% tolerance.

Q: What are the characteristics of the temperature switch in the 175U3316 brake resistor?

A: The integrated temperature switch on the 175U3316 is normally closed and activates at 180 °C.

Q: What is the maximum permitted housing temperature for the 175U3316?

A: This brake resistor can safely withstand a maximum housing temperature of 300 °C during operation.

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