3RH1921-1RA10
AUXILIARY SWITCH BLOCK, 1 NO,

From SIEMENS

Auxiliary switch block, 1 NC, EN 50005, on the side, 10 mm, screw terminal, Size S0 ... S3, for motor contactors, 1-pole ! Phased-out product! Successor is SIRIUS 3RH2
General technical data
Product brand nameSIRIUS
Suitability for useContactor relay and power contactor
Protection class IP on the frontIP20
Ambient temperature
during storage-55 ... +80 °C
during operation-25 ... +60 °C
Mechanical service life (switching cycles) typical10 000 000
Electrical endurance (switching cycles) at AC-15 at 230 V typical200 000
Contact reliabilityone incorrect switching operation of 100 million switching operations (17 V, 5 mA)
Contact reliability of auxiliary contacts1 faulty switching per 100 million (17 V, 1 mA)
Insulation voltage with degree of pollution 3 rated value500 V
Surge voltage resistance rated value6 kV
Auxiliary circuit
Number of NC contacts for auxiliary contacts
instantaneous contact0
Number of NO contacts for auxiliary contacts
instantaneous contact1
Operating current of auxiliary contacts at AC-12
at 24 V10 A
at 230 V10 A
maximum10 A
Operating current
of auxiliary contacts
— at AC-14
— at 125 V6 A
— at 250 V6 A
— at AC-15
— at 24 V6 A
— at 230 V6 A
— at 400 V3 A
at AC-15 at 690 V rated value1 A
Operating current
of auxiliary contacts at DC-12
— at 24 V10 A
— at 110 V3 A
— at 220 V1 A
with 2 current paths in series at DC-12
— at 24 V rated value10 A
— at 60 V rated value10 A
— at 110 V rated value4 A
— at 220 V rated value2 A
— at 440 V rated value1.3 A
— at 600 V rated value0.65 A
with 3 current paths in series at DC-12
— at 24 V rated value10 A
— at 60 V rated value10 A
— at 110 V rated value10 A
— at 220 V rated value3.6 A
— at 440 V rated value2.5 A
— at 600 V rated value1.8 A
Operating current
of auxiliary contacts at DC-13
— at 24 V6 A
— at 60 V2 A
— at 110 V1 A
— at 220 V0.3 A
with 2 current paths in series at DC-13
— at 24 V rated value10 A
— at 60 V rated value3.5 A
— at 110 V rated value1.3 A
— at 220 V rated value0.9 A
— at 440 V rated value0.2 A
— at 600 V rated value0.1 A
with 3 current paths in series at DC-13
— at 24 V rated value10 A
— at 60 V rated value4.7 A
— at 110 V rated value3 A
— at 220 V rated value1.2 A
— at 440 V rated value0.5 A
— at 600 V rated value0.26 A
Installation/ mounting/ dimensions
Mounting typesnap-on mounting
Width10 mm
Height80 mm
Depth71 mm
Connections/Terminals
Type of electrical connection for auxiliary and control current circuitscrew-type terminals
Type of connectable conductor cross-sections
for auxiliary contacts
— finely stranded
— with core end processing2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
at AWG conductors for auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
Safety related data
Product function Mirror contact acc. to IEC 60947-4-1Yes
Notewith 3RT1
Product function positively driven operation acc. to IEC 60947-5-1No

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