SIEMENS
Siemens 3RV2421-4BA10 is a compact, high-performance SIRIUS size S0 circuit breaker designed specifically for transformer protection. Featuring an adjustable thermal overload release of 13–20 A and a fixed magnetic trip (N-release) of 325 A, it ensures robust safety for electrical systems with screw terminal connectivity.
The Siemens 3RV2421-4BA10 is part of the renowned SIRIUS modular system, engineered to provide short-circuit and overload protection for transformers. Its "Size S0" footprint makes it an ideal choice for space-constrained control cabinets while maintaining a standard switching capacity. This circuit breaker is optimized for handling the high inrush currents typical of transformer start-ups without nuisance tripping.
Provides transformer protection with precise A- and N-release ratings
Rated A-release 13–20 A and N-release 325 A for optimal current control
Screw terminal connections for secure and easy installation
Standard switching capacity suitable for a wide range of electrical systems
Precision Protection: Tailored A-release range (13–20 A) allows for fine-tuned protection based on specific transformer requirements.
High Inrush Handling: The 325 A N-release is specifically calibrated for transformer-fed circuits.
Space Efficient: The S0 frame size maximizes cabinet density without sacrificing performance.
Easy Integration: Part of the Siemens SIRIUS family, ensuring seamless compatibility with contactors and overload relays.
Durable Design: Built for industrial environments with high-quality screw terminals for secure wiring.
Product Number: 3RV2421-4BA10
Size: S0
A-release: 13–20 A
N-release: 325 A
Connection Type: Screw terminal
Switching Capacity: Standard
Manufacturer: Siemens
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| SKU / Model | 3RV2421-4BA10 |
|---|---|
| Brand | SIEMENS |
| product brand name | SIRIUS |
| product designation | Circuit breaker |
| design of the product | For transformer protection |
| product type designation | 3RV2 |
| size of the circuit-breaker | S0 |
| size of contactor can be combined company-specific | S00, S0 |
| product extension auxiliary switch | Yes |
| power loss [W] for rated value of the current | - |
| ● at AC in hot operating state | 10.5 W |
| ● at AC in hot operating state per pole | 3.5 W |
| insulation voltage with degree of pollution 3 at AC rated value | 690 V |
| surge voltage resistance rated value | 6 kV |
| maximum permissible voltage for safe isolation in networks with grounded star point | - |
| ● between main and auxiliary circuit | 400 V |
| shock resistance acc. to IEC 60068-2-27 | 25g / 11 ms |
| mechanical service life (switching cycles) | - |
| ● of the main contacts typical | 100 000 |
| ● of auxiliary contacts typical | 100 000 |
| electrical endurance (switching cycles) typical | 100 000 |
| reference code acc. to IEC 81346-2 | Q |
| installation altitude at height above sea level maximum | 2 000 m |
| ambient temperature | - |
| ● during operation | -20 ... +60 °C |
| ● during storage | -50 ... +80 °C |
| ● during transport | -50 ... +80 °C |
| temperature compensation | -20 ... +60 °C |
| relative humidity during operation | 10 ... 95 % |
| number of poles for main current circuit | 3 |
| adjustable current response value current of the current-dependent overload release | 13 ... 20 A |
| operating voltage | - |
| ● rated value | 20 ... 690 V |
| ● at AC-3 rated value maximum | 690 V |
| operating frequency rated value | 50 ... 60 Hz |
| operational current rated value | 20 A |
| operational current at AC-3 at 400 V rated value | 20 A |
| operating power at AC-3 | - |
| ● at 230 V rated value | 5.5 kW |
| operating frequency at AC-3 maximum | 15 1/h |
| number of NC contacts for auxiliary contacts | 0 |
| number of NO contacts for auxiliary contacts | 0 |
| number of CO contacts for auxiliary contacts | 0 |
| product function | - |
| ● ground fault detection | No |
| ● phase failure detection | Yes |
| trip class | CLASS 10 |
| design of the overload release | thermal |
| breaking capacity operating short-circuit current (Ics) at AC | - |
| ● at 240 V rated value | 100 kA |
| ● at 400 V rated value | 25 kA |
| ● at 500 V rated value | 5 kA |
| ● at 690 V rated value | 2 kA |
| breaking capacity maximum short-circuit current (Icu) | - |
| ● at AC at 240 V rated value | 100 kA |
| ● at AC at 400 V rated value | 55 kA |
| ● at AC at 500 V rated value | 10 kA |
| ● at AC at 690 V rated value | 4 kA |
| response value current of instantaneous short-circuit trip unit | 325 A |
| full-load current (FLA) for 3-phase AC motor | - |
| ● at 480 V rated value | 20 A |
| ● at 600 V rated value | 20 A |
| yielded mechanical performance [hp] | - |
| ● for single-phase AC motor | - |
| — at 110/120 V rated value | 1.5 hp |
| — at 230 V rated value | 3 hp |
| ● for 3-phase AC motor | - |
| — at 200/208 V rated value | 7.5 hp |
| — at 220/230 V rated value | 5 hp |
| — at 460/480 V rated value | 10 hp |
| product function short circuit protection | Yes |
| design of the short-circuit trip | magnetic |
| design of the fuse link for IT network for short-circuit protection of the main circuit | - |
| ● at 400 V | gL/gG 63 A |
| ● at 500 V | gL/gG 50 A |
| ● at 690 V | gL/gG 50 A |
| mounting position | any |
| fastening method | screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715 |
| required spacing | - |
| ● for grounded parts at 400 V | - |
| ● for live parts at 400 V | - |
| ● for grounded parts at 500 V | - |
| ● for live parts at 500 V | - |
| ● for grounded parts at 690 V | - |
| ● for live parts at 690 V | - |
| — downwards | 50 mm |
| — upwards | 50 mm |
| — backwards | 0 mm |
| — at the side | 30 mm |
| — forwards | 0 mm |
| product component removable terminal for auxiliary and control circuit | No |
| type of electrical connection | - |
| ● for main current circuit | screw-type terminals |
| arrangement of electrical connectors for main current circuit | Top and bottom |
| type of connectable conductor cross-sections | - |
| — solid or stranded | 2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²) |
| — finely stranded with core end processing | 2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm² |
| ● at AWG cables for main contacts | 2x (16 ... 12), 2x (14 ... 8) |
| tightening torque | - |
| ● for main contacts with screw-type terminals | 2 ... 2.5 N·m |
| design of screwdriver shaft | Diameter 5 to 6 mm |
| size of the screwdriver tip | Pozidriv 2 |
| design of the thread of the connection screw | - |
| ● for main contacts | M4 |
| B10 value | - |
| proportion of dangerous failures | - |
| ● with high demand rate acc. to SN 31920 | 50 % |
| failure rate [FIT] | - |
| ● with low demand rate acc. to SN 31920 | 50 FIT |
| T1 value for proof test interval or service life acc. to IEC 61508 | 10 y |
| protection class IP on the front acc. to IEC 60529 | IP20 |
| touch protection on the front acc. to IEC 60529 | finger-safe, for vertical contact from the front |
| display version for switching status | Handle |
| other | Railway |
| last modified: | 11/30/2021 |
| Weight | 0.360 kg |
| Dimensions | 49.00 × 102.00 × 102.00 mm |
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