3VA9978-0AA22
3VA9978-0AA22

3VA9978-0AA22

Siemens
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Siemens 3VA9978-0AA22 is an auxiliary switch accessory designed for use with Siemens 3VA molded case circuit breakers, providing reliable switching control through a changeover contact configuration. It is rated for 3 A at 300 V AC and 250 V DC, with a surge voltage resistance of 4 kV and an overvoltage category of III. This compact unit measures 3.94 inches in length, 0.31 inches in width, and 6.89 inches in height, weighing 5 lb, and features screw-type terminal connections for AWG 20 to 16 conductors with a tightening torque of 0.4 to 0.5 N·m. It complies with UL Listed standards and is certified for operation in temperatures ranging from -13°F to 158°F (-25°C to 70°C). Typical applications include industrial and commercial power distribution systems requiring auxiliary switching within 3VA circuit breaker frames.

Key Features & Specifications
  • Type: Auxiliary switch
  • Rated Current: 3 A
  • Operating Voltage AC: 300 V
  • Operating Voltage DC: 250 V
  • Contact Type: Changeover (CO)
  • Mechanical Design: 1 slot, 7 mm width
  • Surge Voltage Resistance: 4 kV
  • Degree of Pollution: 3
  • Overvoltage Category: III
  • Lead Time: 20 ms
  • Tightening Torque: 0.4 to 0.5 N·m
  • Conductor Cross Section: AWG 20 to 16
  • Compact Size: 3.94 in L x 0.31 in W x 6.89 in H
  • Weight: 5 lb
  • Standards: UL Listed
  • Certification: UL Listed
  • Compatible Frames: 3VA
  • Temp Rating: -13°F-158°F (-25°C-70°C)


Siemens 3VA9978-0AA22 - Auxiliary Switch 3A 300V AC