The Siemens 3RH1921-2CA10-ZW98 is a front-side auxiliary switch that adds one normally-open (NO) contact to a 3RT1 contactor. The spring-type (cage-clamp) terminal accepts solid or ferruled stranded conductors up to 2.5 mm² — no screwdriver torque check needed on the line, which saves time in high-density panels where access is tight.
Siemens 3RH1921-2CA10-ZW98 Auxiliary Switch, 1 NO, Spring Te
MPN3RH1921-2CA10-ZW98
Siemens 3RH1921-2CA10-ZW98, front-side auxiliary switch, 1 NO contact, Spring-type terminal, for contactors 3RT1, multi-unit packaging = 188 units.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
Where can I buy 3RH1921-2CA10-ZW98?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.
What contactors does this auxiliary switch fit?
It is designed for the Siemens 3RT1 contactor family. Front-side mounting means it occupies no additional DIN-rail space.
MPN
3RH1921-2CA10-ZW98