• Siemens SENTRON 3VA auxiliary/alarm switches (AUX, LCS, TAS, SAS, EAS)
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Siemens SENTRON 3VA auxiliary/alarm switches (AUX, LCS, TAS, SAS, EAS)

Siemens SENTRON 3VA auxiliary/alarm switches (AUX, LCS, TAS, SAS, EAS)

Internally mountable auxiliary and alarm switches for SENTRON 3VA1 and 3VA2 molded case circuit breakers.

Key features

  • Auxiliary switches AUX signal the position of the main contacts
  • Leading changeover switches LCS open 20 ms before the main contacts, e.g. for load shedding
  • Trip alarm switches TAS signal every tripping operation; SAS only short-circuit trips
  • Electrical alarm switches EAS (3VA2) signal tripping by the ETU
  • HQ (7 mm, 1 slot) and HP (14 mm, 2 slots) versions, standard or electronic-compatible

Specifications

Brand Siemens
Product type Molded case circuit breaker accessory
Catalogue chapter LV 10 chapter 2, Molded Case Circuit Breakers
Applicable frames 3VA10-15, 3VA20-26
Ordering Article numbers as printed in LV 10
Product line SENTRON 3VA molded case circuit breakers
Mounting Internal accessory slots
Standard IEC 60947-5-1
Source Siemens Catalog LV 10 · 2026, p. 208-208
3VA9988-0AA12 Item: Auxiliary switches AUX | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA10-15, 3VA20-26
3VA9988-0AA13 Item: Auxiliary switches AUX | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA10-15, 3VA20-26
3VA9988-0AA11 Item: Auxiliary switches AUX | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA22 Item: Leading changeover switches LCS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA23 Item: Leading changeover switches LCS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA21 Item: Leading changeover switches LCS | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AB12 Item: Trip alarm switches TAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA10-15, 3VA20-26
3VA9988-0AB13 Item: Trip alarm switches TAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA10-15, 3VA20-26
3VA9988-0AB11 Item: Trip alarm switches TAS | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AB32 Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA11
3VA9988-0AB34 Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA12-14
3VA9988-0AB33 Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA11
3VA9988-0AB35 Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA12-14
3VA9988-0AB22 Item: Electrical alarm switches EAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA20-26
3VA9988-0AB23 Item: Electrical alarm switches EAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA20-26
AccessoriesSiemens
15 product codes available in this family
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Siemens SENTRON 3VA auxiliary/alarm switches (AUX, LCS, TAS, SAS, EAS)

Brand Siemens·Accessories

Available part numbers (15)

3VA9988-0AA12, 3VA9988-0AA13, 3VA9988-0AA11, 3VA9988-0AA22, 3VA9988-0AA23, 3VA9988-0AA21, 3VA9988-0AB12, 3VA9988-0AB13, 3VA9988-0AB11, 3VA9988-0AB32 + 5 more — see full table ↓

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Product codes & specifications
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Product codeSpec
3VA9988-0AA12Item: Auxiliary switches AUX | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA10-15, 3VA20-26
3VA9988-0AA13Item: Auxiliary switches AUX | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA10-15, 3VA20-26
3VA9988-0AA11Item: Auxiliary switches AUX | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA22Item: Leading changeover switches LCS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA23Item: Leading changeover switches LCS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA11-15, 3VA20-26
3VA9988-0AA21Item: Leading changeover switches LCS | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AB12Item: Trip alarm switches TAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA10-15, 3VA20-26
3VA9988-0AB13Item: Trip alarm switches TAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA10-15, 3VA20-26
3VA9988-0AB11Item: Trip alarm switches TAS | Type: HP, 14 mm (2 slots) | Ie max: 10 A | Ue AC/DC: 600 V/250 V | Version: Standard | Frame: 3VA11-15, 3VA20-26
3VA9988-0AB32Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA11
3VA9988-0AB34Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA12-14
3VA9988-0AB33Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA11
3VA9988-0AB35Item: Short circuit alarm switches SAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA12-14
3VA9988-0AB22Item: Electrical alarm switches EAS | Type: HQ, 7 mm (1 slot) | Ie max: 6 A | Ue AC/DC: 240 V/250 V | Version: Standard | Frame: 3VA20-26
3VA9988-0AB23Item: Electrical alarm switches EAS | Type: HQ, 7 mm (1 slot) | Ie max: < 1 A | Ue AC/DC: 24 V/24 V | Version: Electronic-compatible | Frame: 3VA20-26

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