The 3RH1911-1LA20 is a Siemens SIRIUS auxiliary switch block intended for installation on compatible size S00 contactors and contactor relays. This version uses screw terminals, has two normally open contacts, and provides top-entry connection.
For industrial spare-parts purchasing, the complete Siemens article number is important because the 3RH19 range contains multiple auxiliary contact configurations with different contact arrangements, terminal styles, and mounting variants.
Part Identification
| Item | Specification |
|---|---|
| Manufacturer | Siemens |
| Article Number | 3RH1911-1LA20 |
| Product Type | Auxiliary Switch Block |
| Product Family | SIRIUS 3RH19 |
| Contactor Size | S00 |
| Contact Configuration | 2 NO |
| Connection | Screw terminal |
| Cable Entry | From above |
| Standard | EN 50005 |
| Mounting | Front-mounted accessory |
Configuration at a Glance
The suffix of this Siemens article number identifies a particular accessory configuration. For 3RH1911-1LA20, the relevant purchasing characteristics are:
| Configuration | Value |
|---|---|
| Auxiliary Contacts | 2 normally open |
| Terminal Technology | Screw connection |
| Connection Direction | Top |
| Contactor Size | S00 |
| Accessory Family | 3RH19 |
| Intended Equipment | Auxiliary and motor contactors |
Electrical & Mechanical Data
| Parameter | Value |
|---|---|
| Rated Insulation Voltage | Up to 690 V |
| Front Protection | IP20 |
| Contact Arrangement | 2 NO |
| Mechanical Service Life | Up to 10 million operating cycles typical |
| Electrical Endurance at AC-15, 230 V | Up to 200,000 operating cycles typical |
| Net Weight | Approx. 0.044 kg |
The published Siemens 3RH19 data specifies the general electrical and mechanical characteristics for this auxiliary-switch family; configuration-specific ordering details should be checked against the complete article number.
Where It Fits
The 3RH1911-1LA20 is an accessory rather than a standalone contactor. It is selected according to the contactor or contactor relay already installed in the equipment.
Typical stock requirements include:
- Replacement of an existing auxiliary switch block
- Spare-parts inventory for S00 contactors
- Restoration of an installed SIRIUS switching assembly
- Maintenance of older Siemens contactor configurations
- Matching an existing component identified by its MLFB number
Can't find the version you need?
Ordering Check
Before purchasing this part, compare the following:
| Check | What to Confirm |
|---|---|
| Article number | 3RH1911-1LA20 |
| Contactor size | S00 |
| Contact arrangement | 2 NO |
| Connection | Screw terminal |
| Cable entry | From above |
| Existing accessory | Compare installed configuration |
This is particularly important within the 3RH19 family because visually similar auxiliary blocks can have different contact arrangements or connection configurations.
The 3RH1911-1LA20 is an older Siemens product reference. Current product records identify it as phase-out and list 3RH2911-1LA20 as the successor.
For replacement purchasing, the original 3RH1911-1LA20 reference should therefore be checked against the installed equipment and existing spare-parts records before selecting a newer version.
Product Data
| Attribute | Detail |
|---|---|
| Brand | Siemens |
| SIRIUS Family | 3RH19 |
| Accessory Type | Auxiliary switch block |
| Contact Type | Normally open |
| Number of Contacts | 2 |
| Connection Technology | Screw terminal |
| Mounting Position | Front |
| Equipment Size | S00 |
| Status | Phase-out product |
| Successor Reference | 3RH2911-1LA20 |
Frequently Asked Questions
Q: What is Siemens 3RH1911-1LA20?
A: It is a 2 NO auxiliary switch block from the Siemens SIRIUS 3RH19 family for compatible S00 contactors and contactor relays.
Q: How is 3RH1911-1LA20 connected?
A: This version uses screw terminals with connection from above.
Q: Is 3RH1911-1LA20 the main contactor?
A: No. It is an auxiliary accessory installed with a compatible contactor or contactor relay.
Q: Is this Siemens part discontinued?
A: Siemens product records indicate that the 3RH1911 series is being phased out. For this specific version, 3RH2911-1LA20 is identified as the successor.
Q: What should be checked when replacing it?
A: The most important points are the complete article number, S00 equipment size, 2 NO contact arrangement, screw-terminal configuration, and connection direction.
Supply Information
We supply Siemens SIRIUS switching-device accessories and industrial spare parts for replacement, maintenance inventory, and existing equipment requirements. Contact us for availability and quotation of 3RH1911-1LA20.
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