Contattore DC Siemens 3RT1024-1BB40

Model Interpretation and Basic Information

Articolo	Dettagli
Modello completo	3RT1024-1BB40
Serie di prodotti	Siemens SIRIUS 3RT1 Series (Interrotto, Modello sostitutivo: 3RT2024-1BB40)
Structural Specification	3-palo, Size S0, Screw Termination, IP20 Protection Class
Tensione della bobina	DC24V (24 Volt DC)
Configurazione del contatto principale	3 Normalmente aperto (3NO)
Categoria di applicazione	AC-3 (Three-Phase Motor Load) 12UN, 5.5kW/400V

Core Parameters of Thermal Current (Ith)
Thermal Current of Main Contacts

Current Type	Rated Value	Condizioni applicabili	Osservazioni
AC-1 (Carico resistivo) Corrente termica	40UN	690V e, 50/60Hz	Maximum allowable current for long-term operation
AC-3 (Carico del motore) Corrente nominale	12UN	400V e, 50/60Hz	Corresponding to 5.5kW three-phase motor
DC-1 (DC Resistive Load) Corrente termica	12UN	24A DC	Long-term operating current for DC circuits
DC-3 (DC Motor Load) Corrente nominale	8UN	24A DC	Starting and operating current for DC motors

Thermal Current of DC24V Coil

Parametro	Valore	Calculation Basis
Potenza nominale della bobina	5.9W	Siemens official data
Coil Thermal Current	0.246UN	I = P/U = 5.9W/24V
Resistenza della bobina	ca. 97.5	R = U/I = 24V/0.246A
Coil Pick-Up/Holding Power	5.9W for both	DC coil has the same pick-up and holding power

III. Key Technical Characteristics

Load Adaptation: Suitable for controlling ≤12A resistive load or ≤8A DC motor load in DC24V circuits
Temperatura operativa: -25°C ~ 60°C, adaptable to industrial environments
Vita meccanica: 3×10⁷ operations, Vita elettrica (AC-3): 1×10⁶ operations
Tensione di isolamento: 690V, reliable electrical isolation performance
Modelli sostitutivi e compatibilità

Preferred Replacement Model: 3RT2024-1BB40 (Siemens SIRIUS 3RT2 Series)

Identical main contact and coil parameters, with an additional 1NO+1NC auxiliary contact

Compatible mounting dimensions for direct replacement

Other Compatible Models:

Schneider: LC1D12BD (DC24V, 12UN, 3NO)

ABB: A12-30-0124VDC (12UN, 3NO, DC24V)

Note sull'utilizzo
DC Circuit Application: When controlling DC24V circuits, derate the main contacts for use (≤12A resistive load) and install a surge suppressor (freewheeling diode) to protect the contacts
Heat Management: Ensure adequate ventilation for the contattore, avoid enclosed installation, and further derate the load when the ambient temperature exceeds 40°C (10% derating for every 10°C rise)
Protezione della bobina: For the DC24V coil, pay attention to power supply fluctuations (allowable range: 21.6V~26.4V DC) to avoid burnout due to overvoltage
Metodo di montaggio: Supports 35mm standard DIN rail mounting or panel mounting, with no restriction on mounting direction

Riepilogo

For Siemens 3RT1024-1BB40 in DC24V circuits, the thermal current of the main contacts is 12A (carico resistivo) and the thermal current of the DC24V coil is approximately 0.246A. This model has been discontinued, and it is recommended to use the replacement model 3RT2024-1BB40 as the first choice, which features better performance and an added auxiliary contact function.

Siemens 3RT1024-1BB40 Selection Quick Reference Table (DC24V/Thermal Current Special)

Scenari applicabili: Procurement Verification / On-Site Installation / Model Replacement / Parameter Review

Module	Articolo	Rated Parameter/Core Information	Remarks/Applicable Conditions
Informazioni di base	Modello del prodotto	3RT1024-1BB40	Siemens SIRIUS 3RT1 Series (Interrotto)
	Tensione della bobina	DC24V (Corrente continua)	Consistent pick-up/holding power
	Configurazione dei contatti	3-contatti principali del polo (3NO), no auxiliary contacts	Protezione IP20, screw termination
	Structural Specification	Size S0, 35Montaggio su guida DIN standard da mm	No mounting direction restriction, panel/rail mountable
Main Contact Current Parameters	AC-1 (Carico resistivo) Corrente termica	40A@690V AC/50/60Hz	Maximum allowable current for AC long-term operation
	AC-3 (Carico del motore) Corrente nominale	12A@400V AC/50/60Hz (5.5kW three-phase motor)	Rated for AC motor starting/operation
	DC-1 (Carico resistivo) Corrente termica	12A@24V DC	Core parameter for DC24V long-term operation (Key Point)
	DC-3 (Carico del motore) Corrente nominale	8A@24V DC	Adapted for DC24V motor load
DC24V Coil Parameters	Potenza nominale	5.9W	Siemens official rating
	Coil Thermal Current	0.246UN	Calculation formula: I=P/U=5.9W/24V
	Resistenza della bobina	ca. 97.5OH	Calculation formula: R=U/I=24V/0.246A
	Allowable Voltage Range	21.6V~26.4V DC (±10%)	Avoid coil burnout from over/undervoltage
Life/Insulation	Vita meccanica	3×10⁷ operations	Durata di livello industriale
	AC-3 Electrical Life	1×10⁶ operations	Adapted for frequent motor start/stop
	Tensione di isolamento	690V CA/CC	Reliable electrical isolation performance
Preferred Replacement Model	Modello	3RT2024-1BB40 (Serie Siemens 3RT2)	Original factory upgraded model, direct compatible replacement
	Core Compatibility Points	Same main contact/coil/mounting dimensions as 3RT1024-1BB40	No rewiring cost, sostituzione diretta
	Upgrade Points	Added 1NO+1NC auxiliary contacts, improved protection/durability	First choice for cost performance
Cross-Brand Compatible Models	Schneider	LC1D12BD	DC24V, 3NESSUN contatto principale, 12A@400V AC-3
	ABB	A12-30-01*24VDC	DC24V, 3NESSUN contatto principale, 12A@400V AC-3
Installation/Usage Key Points	Requisiti di installazione	35Guida DIN standard da mm, ventilated installation, avoid enclosure	Reduce temperature rise, ensure heat dissipation
	Protezione CC	Install a freewheeling diode on main contacts when controlling DC24V circuits	Suppress surges, prevent contact erosion
	Temperature Derating	10% load current derating for every 10°C rise when ambient temperature ＞40℃	per esempio., DC24V resistive load ≤10.8A at 50℃
	Temperatura operativa	-25℃ ~ 60℃	Adapted for industrial high/low temperature environments