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Siemens auxiliary contact block, side-mount, two normally closed contacts

SIEMENS

SIEMENS 3RH29211DA02 Auxiliary Contact 10A Side Mounting 2NC

SKU CH-HNHC-BZXGG

Side-mount auxiliary contact with two normally-closed circuits rated at 10 A for 127 V or 240 V AC control circuits

  • Two normally-closed contacts for reliable safety-circuit signalling
  • 10 A rating handles standard control-circuit loads
  • Side-mount design fits 3RT2, 3RH2 and S00-S3 frame contactors
  • Rated for 127 V AC and 240 V AC control voltages
  • Maximum of two contact blocks per starter size 00 to 3

Application and Compatibility

The Siemens 3RH29211DA02 auxiliary contact is designed for industrial control panels that use 3RT2 or 3RH2 contactors in frame sizes S00 through S3. It provides two normally closed contacts for signalling or interlocking duties in motor starter circuits.

Contact Configuration

The block adds two NC poles and zero NO poles, giving a fixed 2NC arrangement for safety chains or feedback loops. Rated at 10 A with 127V AC and 240V AC ratings, it mounts directly on the side of the contactor without extra wiring or accessories.

Decisive Specification

The critical figure is the 2NC contact count with a 10 A rating at 127V AC and 240V AC; panels that require normally open poles, higher current or a different voltage class cannot use this block.

Highlights

  • Two normally-closed contacts for reliable safety-circuit signalling
  • 10 A rating handles standard control-circuit loads
  • Side-mount design fits 3RT2, 3RH2 and S00-S3 frame contactors
  • Rated for 127 V AC and 240 V AC control voltages
  • Maximum of two contact blocks per starter size 00 to 3

Specifications

BrandSIEMENS

Questions about this item

How often should the 2NC auxiliary contacts be inspected or replaced in a 10A circuit?

The 2NC contacts are rated for 10A at 127V AC or 240V AC; follow the maintenance schedule of the host contactor for inspection intervals.

What limits continuous operation when this block is mounted on a 3RT2 or 3RH2 starter?

The block adds two normally closed contacts without increasing the starter’s rated current, so the contactor’s own thermal limit is reached first.

Does the side-mounted block add noticeable heat or noise during all-day operation?

The auxiliary block is passive — it draws no coil power and generates no audible noise or measurable heat beyond the host contactor.

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