Siemens 3RT20171AB02 S00 Contactor

Contact Configuration and Power Pole Details

The 3RT20171AB02 is an S00-frame electromechanical contactor from Siemens housing three normally open (3PST-NO) power poles rated 12 A per pole. The title suffix 1NC denotes one normally closed auxiliary contact integral to the body. Both the power poles and auxiliary contact share the same catalog record; the auxiliary contact function is captured under the "Features: Auxiliary Contacts" field.

The auxiliary contact configuration is the primary differentiator among the four highest-similarity alternates (all at similarity 1.0). The 3RT20171AB01 and 3RT20171AB011AA0 carry the 1NO suffix instead, swapping the auxiliary to normally open.

Coil and Operating Specifications

The coil is rated for 24 VAC with a must-operate threshold of 20.4 VAC (85% of nominal). Pull-in power is specified at 37 VA for the seed record. Operate time is 33 ms with an operating temperature window of 25°C to 60°C.

Three alternates in the same voltage class (1NC suffix) show coil power of 33 VA and operate time of 35 ms — those records reflect the packaged variant (encapsulation: Box) rather than bulk packaging. The bulk-encapsulated seed part carries the higher VA figure.

Mounting and Physical Integration

Mounting is supported via chassis mount or DIN rail (TH35 rail per S00 convention). No explicit footprint dimensions or IP rating appear in the catalog record. Integration notes specific to enclosure space, terminal torque, or bus bar clearance require the reader's own documentation.

Catalog Comparison — Identical Voltage Class

The three alternates below share the same 24 VAC coil rating and 12 A contact rating. All belong to the 3RT2017 base product family.

3RT20171AB021AA0 shares the same 1NC auxiliary configuration and base product number. The Box encapsulation and lower 33 VA coil rating reflect the packaged version — the must-operate voltage is unchanged at 20.4 VAC. Operate time extends by 2 ms relative to the seed.

3RT20171AB01 differs in auxiliary polarity — 1NO instead of 1NC — while preserving the same 37 VA coil and 33 ms operate time. The 1NO variant suits applications requiring a normally open auxiliary for status signaling or interlock chains rather than a normally closed tie-in.

Catalog Comparison — Coil Voltage Variants

Three alternates at 0.96 similarity deviate from the 24 VAC coil while retaining the 12 A / 3PST-NO main pole structure and S00 frame base product.

3RT20171AH02 and 3RT20171AD02 sit in the low-voltage AC range (42–48 VAC), maintaining the same 33 VA coil class as the packaged 1NC variants above. Must-operate thresholds scale proportionally with nominal voltage. Neither matches the bulk-packaged seed's 37 VA figure.

3RT20171AP02 at 230 VAC diverges more substantially: contact rating rises to 22 A and the main pole form shifts to SPST-NC (1 Form B). The must-operate threshold is 184 VAC, reflecting the higher nominal class.

FAQ

What does the "1NC" suffix on 3RT20171AB02 indicate? It denotes one normally closed auxiliary contact integrated into the contactor body. The main poles are three normally open (3PST-NO), rated 12 A each.

Can the 3RT20171AB02 be mounted on a DIN rail without additional adapters? Yes — the catalog record lists both chassis mount and DIN rail as supported mounting types for the S00 frame.

How does the operate time of 33 ms for 3RT20171AB02 compare to the 35 ms listed for the box-encapsulated alternates? The seed record (bulk packaging) specifies 33 ms; the boxed alternates show 35 ms. Both values are sourced from the catalog records — no inference is made about which packaging method drives the difference.