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          Apter Power supports 3RH5921-1FA22 quotations, manuals, contact selection, and exact-model checks.

        3RH5921-1FA22

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        1001 reviews ｜ Need a Specific Revision?
        For SIRIUS contactors, Siemens 3RH5921-1FA22 is a four-pole auxiliary switch block that adds two normally open and two normally closed control contacts.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Technical specifications for 3RH5921-1FA22

        • Manufacturer:
          Siemens
        • Part Number:
          3RH5921-1FA22
        • Product Family:
          Siemens Drives & Motion Control
        • Product Type:
          4-Pole Auxiliary Switch Block
        • Stock:
          1
        • Contact Arrangement:
          2 NO + 2 NC
        • Terminal Numbering:
          EN 50005
        • Mounting Method:
          Snap-on front mounting
        • Suitable Equipment:
          Contactor relay and power contactor
        • Contactor Size:
          S0
        • Rated Insulation Voltage:
          690 V AC
        • Rated Impulse Withstand:
          6 kV
        • Front Protection Rating:
          IP20
        • Mechanical Life:
          10,000,000 cycles typical
        • Electrical Life at AC-15 230 V:
          200,000 cycles typical
        • AC-15 Current at 230 V:
          6 A
        • AC-15 Current at 400 V:
          3 A
        • DC-12 Current at 24 V:
          10 A
        • Terminal Type:
          Screw terminals
        • Conductor Cross-Section:
          0.5 to 2.5 mm²
        • Operating Temperature:
          -25 to +60 °C
        • Weight:
          0.1587 lbs (0.072 kg)
        • Estimated shipping dimensions:
          6.3x5.1x4.5cm
        • Tariff Code:
          85389000
        • Country of origin:
          China
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Contact Mapping Front Mounting Control Loading Status Use

        Features:

        • Adds two NO and two NC auxiliary circuits to a compatible SIRIUS contactor.
        • Snaps onto the contactor front so all four poles follow the main mechanism.
        • Uses EN 50005 numbering and screw terminals for identifiable control wiring.
        The accessory translates contactor movement into four separate low-power signalling paths.

        NO and NC circuits can report state or participate in control interlocks without carrying the main load current.

        Electrical loading must follow the utilization category and voltage assigned to the auxiliary circuit.

        The Siemens 3RH5921-1FA22 4-Pole Auxiliary Switch Block may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 3RH5921-1FA22 4-Pole Auxiliary Switch Block Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Relating four auxiliary poles to contactor movement

        • Two NO paths: Both normally open contacts close when the contactor reaches its actuated state.
        • Two NC paths: Both normally closed contacts open as the same mechanism moves.
        • Common motion: All four poles follow the mechanical state of the mounted contactor block.
        • Numbering: EN 50005 markings separate each terminal pair during commissioning.

        Coupling the block to the correct contactor frame

        • Snap-on fit: The housing attaches to the documented front interface without separate panel mounting.
        • Size boundary: The mating contactor must use the stated S0 accessory format.
        • Actuator engagement: Correct seating lets the contactor mechanism drive the auxiliary block fully.
        • Removal check: Release the mounting latch without stressing wired screw terminals.

        Keeping auxiliary circuits within their switching category

        • AC-15 loads: Electromagnetic control devices use the published AC-15 current limit at their voltage.
        • DC paths: Direct-current control circuits follow the lower switching ratings at higher voltage.
        • Insulation level: The insulation and impulse ratings define separation from neighboring circuits.
        • Not main power: The auxiliary poles do not replace the contactor’s load-carrying main contacts.

        Applying contact feedback without inferring an undocumented function

        • Contactor state: A wired auxiliary pole can indicate whether the mechanism has changed position.
        • Interlocking: An NC or NO path can participate in the documented control logic.
        • Mirror contact: Mirror-contact behavior is available where the circuit design calls for it.
        • Safety limit: The absence of positively driven contact documentation prevents treating every pole combination as a safety contact set.
        Description
        Siemens 3RH5921-1FA22 is a SIRIUS four-pole auxiliary switch block for a compatible contactor relay or power contactor. Its two normally open and two normally closed contacts add control, interlock or status paths that follow the mechanical state of the contactor.

        When 3RH5921-1FA22 snaps onto the front of the matched contactor, the contactor mechanism drives all four auxiliary poles together. EN 50005 terminal numbering keeps the two NO and two NC circuits identifiable during panel wiring and testing.

        The screw terminals of 3RH5921-1FA22 accept the documented conductor range and keep the auxiliary circuits separate from the contactor’s main power poles. Control-circuit voltage and utilization category determine the permitted switching current for each auxiliary path.

        A mirror contact is available within 3RH5921-1FA22, but the block is not described as a positively driven contact set. The selected monitoring or interlock design must therefore follow the documented contact behavior instead of inferring a safety function from the 2NO+2NC arrangement.
        Alternative Names
        SIRIUS 3RH5921-1FA22 2NO 2NC 3RH59211FA22 Siemens 3RH5921 1FA22 3RH 5921-1FA22 3RH5921-1FA22 Auxiliary Switch Siemens 3RH59211FA22 3RH592I-1FA22 3RH5921-1FA22 Contact Block
        Technical notes
        Confirm the contactor size, EN 50005 terminal numbering and screw-terminal conductor range before fitting Siemens 3RH5921-1FA22.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why might Siemens 3RH5921-1FA22 not move after it is clipped onto a contactor?
        Check that Siemens 3RH5921-1FA22 is fully seated on the correct S0 front interface so the contactor mechanism engages the block.
        Can 3RH5921-1FA22 switch the motor load directly?
        No. 3RH5921-1FA22 provides auxiliary control contacts; the contactor main poles carry the motor or power load.
        How are the four circuits on Siemens 3RH5921-1FA22 identified?
        Siemens 3RH5921-1FA22 uses EN 50005 terminal numbering for its two normally open and two normally closed contact pairs.
        What rating should be used for a coil circuit wired through 3RH5921-1FA22?
        Use the 3RH5921-1FA22 utilization-category rating at the actual control voltage, such as the documented AC-15 value for an AC coil circuit.
        Does the 2NO+2NC layout make Siemens 3RH5921-1FA22 a safety relay?
        No. Siemens 3RH5921-1FA22 is an auxiliary switch block; any safety function must be supported by the complete documented circuit and contact behavior.

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