 |
loading
| Availability: | |
|---|---|
3RH1921-1EA20
Siemens
The Siemens 3RH1921-1EA20 is a compact auxiliary switch block designed for side-mounting onto Siemens SIRIUS 3RT10 series contactors (Sizes S00 and S0). It provides 1 Normally Open (NO) and 1 Normally Closed (NC) mirror contact for control circuit feedback and interlocking. Rated for up to 690 V AC insulation voltage and 10 A operational current (AC-15), this auxiliary block is fully compliant with IEC 60947-5-1. The screw terminal design with IP20 finger-safe protection ensures secure wiring and operator safety. Typical applications include motor control panels, PLC feedback circuits, and safety interlocking systems where contactor status signaling is required.
FAQ
Q: What is the difference between 3RH1921-1EA20 and a contactor relay?
A: The 3RH1921-1EA20 is an auxiliary switch block that mounts to the side of a 3RT10 contactor. It is not a standalone contactor or relay — it only provides additional NO/NC feedback contacts for control circuits.
Q: Which Siemens contactors are compatible with 3RH1921-1EA20?
A: It is compatible with Siemens 3RT10 series contactors in Sizes S00 and S0. It clips onto the side of the contactor body.
Q: What are the contact ratings for AC-15 duty?
A: The contacts are rated for 10 A at 24 V AC and 110 V AC, 6 A at 230 V AC, and 3 A at 400 V AC under AC-15 utilization category.
Q: Does this auxiliary block require screws to mount?
A: No, the 3RH1921-1EA20 features clip-on side mounting — it snaps directly onto the side of the compatible contactor without additional screws.
Q: What is the insulation voltage rating of this auxiliary switch?
A: The rated insulation voltage (Ui) is 690 V AC, with a rated impulse withstand voltage of 6 kV per IEC 60947-5-1.
Q: Are the contacts suitable for safety circuits?
A: Yes, the contacts are mirror contacts compliant with IEC 60947-5-1, making them suitable for safety feedback and interlocking circuits.
Q: What wire sizes can be connected to the screw terminals?
A: The screw terminals accept rigid conductors from 0.75 mm² to 2.5 mm² and flexible conductors with ferrules from 0.75 mm² to 1.5 mm² (equivalent to 20–14 AWG).
Q: What is the operating temperature range for this device?
A: The 3RH1921-1EA20 operates reliably in ambient temperatures from -25°C to +60°C.
| Siemens 3RH1921-1EA20 Auxiliary Switch Block | |
| Siemens 3RH1921-1EA20 - Technical Specifications | |
| Feature | Specification |
| - | - |
| Product Type | Auxiliary Switch Block (Side Mounting) |
| Order Number | 3RH1921-1EA20 |
| Series | Siemens SIRIUS 3RH19 |
| Number of Contacts | 1 NO + 1 NC (1 Ö + 1 S) |
| Contact Type | Mirror contacts per IEC 60947-5-1 |
| Rated Insulation Voltage (Ui) | 690 V AC |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Rated Operational Current (Ie) - AC-15 | 10 A @ 24 V AC; 10 A @ 110 V AC; 6 A @ 230 V AC; 3 A @ 400 V AC |
| Rated Operational Current (Ie) - DC-13 | 10 A @ 24 V DC; 0.9 A @ 110 V DC; 0.45 A @ 220 V DC |
| Rated Conditional Short-Circuit Current | 10 kA (with 10 A gG fuse) |
| Mounting Type | Clip-on (Side mounting) |
| Compatible With | Siemens 3RT10 contactors, Sizes S00 and S0 |
| Terminal Type | Screw terminals |
| Width | 9 mm |
| Degree of Protection | IP20 (Finger-safe) |
| Standards | IEC 60947-5-1, EN 60947-5-1 |
| Operating Temperature | -25°C to +60°C |
| Commodity Code | 85365080 |
