What devices is this signaling switch compatible with?
Siemens SIRIUS 3RV1 motor starter protectors in sizes S0, S2, and S3
1 actual photo shown first. Reference images are model-matched and must be confirmed before purchase.
Siemens
3RV1921-1M
Signaling switch for circuit breaker Size S0–S3
Siemens
From $15In stockDiscontinued
- GTIN
- 4011209306011
Product Description
This signaling switch is designed for use with Siemens SIRIUS 3RV1 motor starter protectors in frame sizes S0, S2, and S3. It provides discrete indication functions including a separate tripped signal and short-circuit alarm, enabling clear status feedback to control systems. The compact module measures 18 mm wide by 68 mm deep by 90 mm high, allowing straightforward side-mount integration without increasing panel footprint significantly. Rated for AC-15 control duty at up to 690 VAC, 1 A, it supports reliable auxiliary signaling in demanding industrial environments. The device is intended as an accessory for 3RV1 series protectors and aligns with Siemens accessory standards. Note that the 3RV1921-1M variant is identified as a phased-out product by Siemens with successor references under the 3RV2 portfolio; ensure compatibility with installed 3RV1 S0–S3 units before specifying. Package is supplied as a single unit.
Key Features
- •For Siemens 3RV1 S0, S2, S3 protectors
- •Separate trip and short-circuit alarms
- •AC-15 duty 690 VAC, 1 A rated
- •Compact 18 x 68 x 90 mm module
- •Clear auxiliary status signaling
- •Side-mount accessory integration
Buy Options
Condition, indicative price, stock, and lead time. Confirm current availability via RFQ.
ConditionPriceAvailabilityLead time
New
Price: $47.38
Availability: 65 in stock
Lead time: Ships from stock
Never Used
Price: RFQ
Availability: Sourced on request
Lead time: Quoted after RFQ
Used
Price: $15
Availability: 37 in stock
Lead time: Ships from stock
Specifications
- Compatibility
- Siemens 3RV1 Series motor starter protectors, sizes S0, S2, S3
- Dimensions
- 18 mm W x 68 mm D x 90 mm H
- Control duty rating
- AC-15 at 690 VAC, 1 A
- Product type
- Signaling switch for circuit breaker
- Model number
- 3RV1921-1M
- HS code
- 85365080
- UNSPSC
- 39121521
- GTIN-13
- 4011209306011
- UPC
- 754554409870
- Country of origin
- Czechia
- Status
- Phased-out; successor preferred type 3RV2921-1M
- Part #
- 3RV1921-1M
- Category
- Circuit Breaker
- Subcategory
- Circuit Breaker Trip
- Weight
- 0.11 lbs
Before we quote this part
Actual photos when available
Nameplate, condition, and visible wear can be shared before quote when stock photos are not enough.
Test notes for used units
Power-on or function test status is stated when available, with clear condition grading.
Trackable global shipping
DHL, FedEx, UPS, or forwarder options can be quoted with packing photos and tracking details.
Clear DOA boundary
For tested units, quote terms can include 7-day DOA support unless otherwise stated.
Independent sourcing disclaimer
We are not an authorized distributor, reseller, or representative of Siemens, Mitsubishi, Omron, or other manufacturers listed on this site. All product names, trademarks, brands, and logos are the property of their respective owners. Products may be used, refurbished, surplus, or sourced from the secondary market unless otherwise stated.
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FAQ
What are its electrical ratings for control duty?
AC-15 duty rated at up to 690 VAC, 1 A
What are the physical dimensions?
18 mm wide, 68 mm deep, 90 mm high
Is this product still in production?
It is phased out; Siemens lists a preferred successor type 3RV2921-1M
How is the unit sold?
Sold individually as a single accessory module