Siemens 3RT20241AB04 Contactors
Cabinet Placement — 3RT2024 S0 Coil and Contacts
The 3RT20241AB04 is a SIRIUS 3RT2 S0 frame contactor intended for DIN rail or chassis mounting in motor-branch or lighting-contact applications. The 24VAC coil requires a suitable control transformer or Class 2 supply in the panel — the coil draws 65VA inrush and 19.2 VAC minimum operate threshold, which shapes upstream control-circuit sizing.
Contact and Coil Specifications
| Parameter | Value |
|---|---|
| Base product | 3RT2024 |
| Contact form | 3PST-NO (3 Form A main poles) |
| Contact rating | 12 A |
| Coil voltage | 24 VAC |
| Coil power (inrush) | 65 VA |
| Must-operate voltage | 19.2 VAC |
| Operate time | 40 ms |
| Operating temperature | 25°C ~ 60°C |
| Mounting | Chassis mount / DIN rail |
| Encapsulation | Box |
The main pole configuration is listed as 3PST-NO (3 Form A) with two integral auxiliary contacts — one normally open and one normally closed — giving a 2NO/2NC auxiliary function per the title designation.
Family and Voltage Variants
The 3RT2024 series shares the S0 frame, 12 A rating, 65 VA coil power, and DIN rail mounting across all coil voltages. The suffix in each MPN encodes the coil voltage: AB = 24 VAC, AF = 110 VAC, AP = 230 VAC, AV = 400 VAC, AD = 42 VAC. The trailing digit in the part-number position (04 vs 00) differentiates auxiliary contact count — 04 denotes 2NO/2NC; 00 denotes 1NO/1NC.
Comparison — S0 12 A 3RT2024 Family (2NO/2NC Variants)
Readers must qualify alternatives independently against their application voltage and auxiliary contact requirements. Numeric similarity values reflect catalog parametric overlap only.
| Spec | 3RT20241AB04 (seed) | 3RT20241AF04 | 3RT20241AP04 | 3RT20241AV04 |
|---|---|---|---|---|
| Coil voltage | 24 VAC | 110 VAC | 230 VAC | 400 VAC |
| Must-operate | 19.2 VAC | 88 VAC | 184 VAC | 320 VAC |
| Contact rating | 12 A | 12 A | 12 A | 12 A |
| Coil power | 65 VA | 65 VA | 65 VA | 65 VA |
| Operate time | 40 ms | 40 ms | 40 ms | 40 ms |
| Mounting | DIN / chassis | DIN / chassis | DIN / chassis | DIN / chassis |
| Similarity | — | 1.0 | 1.0 | 1.0 |
3RT20241AF04 — Same S0 frame and 65VA coil power at 110 VAC. Maintains 12 A rating and 2NO/2NC auxiliary configuration; differs in must-operate threshold (88 VAC). Suitable for panels fed by 120 VAC control transformers.
3RT20241AP04 — 230 VAC coil variant within the same family. The must-operate voltage shifts to 184 VAC, requiring a 240 VAC control supply. Shares the 65 VA inrush, 40 ms timing, and DIN/chassis mounting.
3RT20241AV04 — 400 VAC coil contactor for use with three-phase 380–415 V control circuits. Must-operate voltage of 320 VAC aligns with standard European control levels. All other specs (12 A, 65 VA, operate time, mounting) are identical.
Engineering Verification Checklist
- Control-circuit voltage matches coil rating (24 VAC nominal; must-operate 19.2 VAC minimum).
- Upstream protection and wire sizing appropriate for 12 A main pole current.
- Panel layout allows DIN rail clearance for box-encapsulated body; operating temperature range is 25°C to 60°C.
- Auxiliary contact arrangement (2NO/2NC) matches logic requirements for the specific circuit.
- Supply transformer VA capacity accommodates 65 VA coil inrush without voltage drop below must-operate threshold.
- Mechanical mounting (DIN rail clip or chassis) verified for installed orientation and vibration environment.
- All related branch components (overload relays, circuit breakers) are rated for the same 12 A frame size and coordination type.