175U3014
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MPN: MCE101A145RP280RE21TAW
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The 175U3014 is a brake resistor manufactured by Danfoss. Part of the VLT Brake Resistors series, it offers a resistance of 145 Ohms and a continuous power rating of 280 Watts. The unit features an IP21 protection class and integrated overtemperature switch. Weighing 1.4 kg, it supports an operating voltage of 380-500 V.
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Product Description:
The VLT brake resistor 175U3014 is built by Danfoss that offers a nominal resistance of 145 Ω and a continuous power rating of 280 W. It can handle a pulse power of 2800 W at 10% duty cycle and 700 W at 40% duty cycle. This brake resistor is housed in an aluminum enclosure that provides both strength and heat dissipation.
The 175U3014 brake resistor has an IP21 protection rating that include a normally closed temperature switch rated 2 A at 250 V AC that activates at 453.15 K. It is designed for vertical mounting, while horizontal mounting requires a 20% derating of its power capacity. The dimension of this unit is 4.5 cm x 7 cm x 16 cm and it has a mass of 1.3 kg. Electrically, it features a resistance tolerance of ±10% and an insulation impedance of around 20000 Ohms at 1 kV, while its dielectric strength is 2500 V AC for one minute. It operates with voltages of IEC up to 690 VAC or 1100 VDC and 600 VAC or 600 VDC at UL. This 175U30 brake resistor delivers 100% of its rated continuous power at 313.15 K when used without a temperature switch and at least 80% when equipped with a switch, which engages at approximately 80% of continuous load.
The 175U3014 brake resistor supports a maximum cable length of 20 meters and it maintains reliable performance at relative humidity levels between 5 - 85%. It gets cooled by natural convection and its power ratings are based on these cooling conditions. The unit functions at 100% load up to 1000 m altitudes above sea level, while supports a derating load of 94% at 1500 m and 82% at 3000 m. The 175U3014 refers to the product code MCE101A145RP280RE21TAW.
Frequently Asked Questions about 175U3014:
Q: Why is the aluminum enclosure important in the Danfoss 175U3014 brake resistor?
A: The aluminum enclosure improves heat dissipation and mechanical strength. This ensures stable operation under thermal stress during braking cycles.
Q: How does the temperature switch in the 175U3014 (MCE101A145RP280RE21TAW) improve safety?
A: The switch opens at 180 °C, preventing overheating. This safeguards both the resistor and the VFD from potential thermal damage.
Q: Why is vertical mounting preferred for the 175U3014 brake resistor?
A: The vertical mounting allows optimal airflow for natural convection cooling. This helps maintain the rated power without requiring derating.
Q: What is the purpose of dielectric strength testing in this brake resistor?
A: Its dielectric strength ensures insulation integrity under high voltage conditions. It verifies safe operation at 2500 V AC for one minute.
Q: Why is the insulation resistance of over 20 MΩ at 1000 V significant in 175U3014?
A: It indicates strong insulation between conductive parts and housing. This prevents leakage currents and enhances electrical reliability.
