3SU1400-1AA10-1BA0

1. Overview

The Siemens 3SU1400-1AA10-1BA0 is a contact module (contact block) in the SIRIUS ACT 3SU1 22mm command-and-signaling system. It is not a complete pushbutton — it clips onto a 3SU1 actuator + holder assembly to provide the electrical switching function. It provides one normally open (NO) contact with a screw terminal for front plate mounting. Part number decoding: 3SU14 = contact module; 1AA10 = 1 NO; 1BA0 = front plate mounting. Directly replaces legacy Siemens 3SB3400-0B from the older 3SB3 series.

2. User Sentiment

No dedicated forum discussions were found — typical for an industrial commodity part. On Amazon UAE it holds 4.0/5 (1 review) noting "high switching reliability even at low voltage." It consistently appears on global most-viewed automation spares lists (WiAutomation, multiple regions), confirming high demand as a maintenance replacement part. An industrial RFQ from Cognor SA (Polish steelworks) ordered 20 units, reflecting standard MRO use. No complaints were found.

3. Real-World Applications

Used in discrete manufacturing control stations: food/beverage, automotive assembly, pharmaceutical packaging, machine tool OEMs, and HVAC panels. Wiring posts show it combined with an NC module (1AA10-1CA0) and 24VDC LED indicator in typical 24V control circuits. Assigned US military NSN 5999-01-667-4862 (CAGE U8248, Siemens Schweiz AG), indicating use in defense/aerospace ground support equipment.

4. Technical Specifications

• Type: Contact module — NOT a complete pushbutton; mounts onto 3SU1 holder/actuator
• Contact configuration: 1 NO (normally open), SPST; positive opening: No
• Contact material: Silver alloy
• Terminal type: Screw terminal; conductor 0.5–1.5 mm²; torque 0.8–0.9 N·m
• Mounting: Front plate mounting (snap-on)
• Insulation voltage (Ui): 500 V AC/DC
• Thermal current (Ith): 10 A
• AC-15: 6 A @ 24–230 V; 3 A @ 400 V; 1.4 A @ 500 V
• DC-13: 3 A @ 24 V; declining to 0.1 A @ 400–500 V
• IP rating: IP40 (enclosure) / IP20 (terminals)
• Operating temperature: −25 to +70 °C
• Mechanical/electrical life: 10,000,000 cycles typical
• Shock (IEC 60068-2-27): 50 g / 11 ms; Vibration: 5 g at 10–500 Hz
• Dimensions (H×W×D): 33.2 × 9.8 × 27.7 mm; weight ~8.2 g
• Standards: IEC 60947-5-1, cULus, VDE, CCC, KC, EAC, CE, UKCA, RoHS; maritime BV/LR/RINA
• HS Code: 85365080; Country of origin: Germany

5. Ordering & Compatibility

Minimum order quantity is 5 units or multiples of 5. Pricing: ~£3.96–£4.85 (UK), ~€6.55–€9.68 (EU), ~$14.55–$24.80 USD; DigiKey stocks 1,236 units. Compatible with all SIRIUS ACT 3SU1 plastic (3SU1500) and metal (3SU1550) holders and all 3SU1000/3SU1100 actuators. Cannot cross-mount to Eaton M22 or Schneider Harmony. Related family: 3SU1400-1AA10-1CA0 (1 NC), 3SU1400-1AA10-1HA0 (1 NC with installation monitoring), 3SU1400-2AA10-1BA0 (1 NO base mount), 3SU1400-1AA10-1DA0 (2 NO).

6. Known Issues

No significant issues reported. Contact type cannot be reconfigured after assembly — must be specified at ordering. For inductive DC loads, RC snubber (0.47 µF / 100 Ω per contact) is recommended. Users needing rear/base-panel mounting must select the 3SU1400-2AA10-1BA0 variant.