Siemens 3SU1400-1AA10-1BA0 — NO Contact Module Price & Stock

By Abdullah Zahid
12 min read
Siemens 3SU1400-1AA10-1BA0 SIRIUS ACT 1 NO screw terminal contact module for 22mm front plate control station

Siemens 3SU1400-1AA10-1BA0 Contact Module with 1 Contact Element, 1 NO, Screw Terminal, for Front Plate Mounting — Specifications, Wiring, and Selection Guide

When a controls engineer or maintenance supervisor is tracking down a catalog number like 3SU1400-1AA10-1BA0, they are usually working against a deadline — replacing a worn contact block in an existing SIRIUS ACT 3SU1 control station or expanding a panel without rebuilding it from scratch. The Siemens 3SU1400-1AA10-1BA0 is a single-channel normally open (NO) contact module rated for 10 A at 24–110 V AC, 500 V insulation voltage, with screw-terminal wiring and front-plate mounting for 22 mm SIRIUS ACT 3SU1 enclosures. This guide covers every technical detail you need to confirm fit, verify ratings, wire it correctly, and avoid common ordering mistakes.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the 3SU1400-1AA10-1BA0 — and Who Shouldn't

This module is the correct choice for engineers and technicians working within an existing SIRIUS ACT 3SU1 control station infrastructure who need a single normally open contact with screw-terminal wiring. It is the right part if all of the following apply to your application:

  • Your control station uses a SIRIUS ACT 3SU1 series plastic or metal 22 mm enclosure — this module mounts directly into the front-plate cavity with no modification
  • You need exactly 1 NO (normally open) contact configuration — one contact element, switching 5–500 V AC/DC
  • Your control wiring uses solid copper conductors in the 0.5–1.5 mm² range and screw-terminal termination is acceptable or preferred
  • Your circuit operating voltage falls within the 5–500 V AC/DC range and your load current does not exceed 10 A at 24–110 V AC
  • An IP40 enclosure rating and -25 to +70 °C ambient operating range meet your environmental conditions

If you need 2 NO contacts or a mixed NO/NC configuration, the 3SU1400-1BA10-1BA0 is the correct choice. If you need an integrated LED indicator alongside the contact, look at the 3SU1300 illuminated module family. If you are not already standardized on SIRIUS ACT 3SU1, confirm the enclosure cavity before ordering — no cross-brand substitution is possible within the same enclosure.

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What the 3SU1400-1AA10-1BA0 Actually Does in a Control Circuit

The Siemens 3SU1400-1AA10-1BA0 is a passive contact switching element — it converts mechanical pushbutton actuation into a discrete electrical switching event for downstream control devices. When an operator presses the pushbutton actuator mounted in the front plate of the SIRIUS ACT 3SU1 enclosure, the contact module's silver-alloy NO contact closes, completing the circuit between its two screw terminals. When the actuator is released, the contact opens. There is no active electronics, no coil, and no logic — just a highly reliable mechanical switch rated for 10,000,000 mechanical cycles.

The module sits physically behind the pushbutton plunger inside the 22 mm enclosure cavity and is held in place by screw retention or snap-in detent depending on the enclosure variant. Its screw terminals accept solid copper conductors from 0.5 to 1.5 mm² without ferrules, or 2x 0.5–0.75 mm² with ferrule end processing. With silver-alloy contact material, the module handles arc suppression across its rated voltage range without lubrication or active maintenance. Because it is a modular field-replaceable component requiring only a screwdriver, it is the standard approach to contact maintenance in SIRIUS ACT 3SU1 control stations rather than replacing the entire enclosure assembly.

Where the 3SU1400-1AA10-1BA0 Sits in a Typical Control System

The 3SU1400-1AA10-1BA0 is the switching layer between the human interface (pushbutton or actuator) and the downstream electrical load or logic input. In a typical discrete control architecture, the signal chain runs through this module before reaching its destination.

  • Control power supply (24 V DC or AC from panel transformer) feeds the incoming terminal of the contact module through the panel's control circuit wiring
  • The SIRIUS ACT 3SU1 enclosure front-plate actuator (pushbutton, key switch, or emergency stop head) mechanically actuates the contact module on operator input
  • The 3SU1400-1AA10-1BA0 contact closes, passing the control voltage signal to the outgoing terminal
  • The outgoing terminal connects to a downstream device: contactor coil, solenoid valve, PLC digital input card, indicator light, or relay module
  • For inductive loads (contactor coils, solenoids), an RC suppressor or varistor is installed at the load terminals to prevent contact arcing and extend module service life

Industries and Applications That Use This Module

The 3SU1400-1AA10-1BA0 is most commonly found in discrete manufacturing environments where control stations face repetitive daily operator interaction. Food and beverage bottling lines, automotive assembly, and pharmaceutical packaging machinery all use SIRIUS ACT 3SU1 stations extensively, and the NO contact module is the most frequently replaced component after 5–10 years of field service due to normal mechanical wear reaching the 10,000,000-cycle threshold.

Machine tool OEM builders specify it for start/stop and interlocking circuits in machining centers and presses, where a single NO contact per function is the standard control architecture. Panel integrators building new control stations for HVAC, refrigeration, and process automation systems source individual 3SU1400 modules alongside enclosures and actuators to configure control stations to exact specification without overbuying compound assemblies.

Retrofit applications represent a significant share of orders — maintaining parts compatibility across aging SIRIUS ACT installations is far more cost-effective than re-engineering the entire mechanical interface, and the 3SU1400-1AA10-1BA0 remains the correct replacement for original-specification NO contact modules across the production life of the 3SU1 series.

Application Typical Deployment
Food and beverage bottling line Start/stop and conveyor control station replacement after 5–10 year mechanical service life
Automotive assembly Interlocking and cycle-start control stations on assembly fixtures; high daily actuation count
Pharmaceutical packaging Modular control station expansion for new interlocking functions without enclosure replacement
Machine tool OEM New panel build-out; individual contact modules sourced per channel for exact function mapping
Process automation / HVAC Control panel start/stop circuits for fans, pumps, and damper actuators at 24–230 V AC
Serial-production machinery retrofit Maintaining SIRIUS ACT 3SU1 parts compatibility across aging installed base without full redesign

Electrical and Mechanical Specifications Worth Verifying Before You Order

Specification Value
Contact configuration 1 NO (normally open)
Contact material Silver alloy
Operating voltage range 5–500 V AC/DC, 50/60 Hz
Thermal current (24–110 V AC) 10 A
Thermal current (230–400 V AC) 8 A
Thermal current (500 V AC) 1.4 A
Insulation voltage 500 V (AC test) / 600 V (rated)
Mechanical service life 10,000,000 operating cycles
Ambient operating temperature -25 to +70 °C
Enclosure / terminal IP rating IP40 enclosure / IP20 terminals

Full technical specifications are available on the product page at LeadTime.ca.

3SU1400-1AA10-1BA0 vs. Other SIRIUS ACT Contact Module Variants

The SIRIUS ACT 3SU1 contact module family spans several configurations that are mechanically interchangeable within the same 22 mm enclosure cavity but electrically distinct. Selecting the wrong catalog number at the point of order is the most common sourcing error with these modules.

Model Contact Config Terminal Type Illuminated Use Case
3SU1400-1AA10-1BA0 1 NO Screw No Standard single-channel NO switching
3SU1400-1BA10-1BA0 2 NO Screw No Two independent NO contacts in one module
3SU1400-1NC10-1BA0 1 NC Screw No Inverted logic; safety and interlocking circuits
3SU1300-1AB10-1CA0 1 contact Screw Yes (LED) Combined switching and visual indication
3SU1400-1BB10-1BA0 Spring-return Screw No Spring-return actuator variant instead of standard plunger

If your application requires exactly one NO contact with screw terminals and no integrated indicator, the 3SU1400-1AA10-1BA0 is the correct choice — check current availability at LeadTime.ca.

Expert Verdict: When This Module Earns Its Place and When It Doesn't

The 3SU1400-1AA10-1BA0 does one thing exceptionally well: it gives you a dependable, field-replaceable NO contact inside a SIRIUS ACT 3SU1 station with zero custom fabrication. The 10,000,000-cycle mechanical rating, silver-alloy contacts, and 24–500 V operating range make it a genuine fit for high-cycle discrete manufacturing environments where control station reliability directly affects uptime. The universal voltage range — 5–500 V AC/DC — means one part number covers the majority of 24 V DC logic circuits and 230 V AC machine control circuits without sourcing separate voltage-specific variants. For any engineer maintaining or expanding an existing SIRIUS ACT 3SU1 infrastructure, this is the replacement or expansion module to specify.

Where this module reaches its limits is clear: if you need two simultaneous NO switching outputs, the 3SU1400-1BA10-1BA0 is the correct part. If you want the operator-facing indicator light integrated into the same cavity rather than a separate indicator module, the 3SU1300 illuminated family is the right call. And at 500 V, the 1.4 A rating is pilot-signal territory only — do not attempt to use this module for direct motor switching at 500 V. The IP40 enclosure rating is adequate for standard panel environments, but not for washdown or high-moisture zones; if that is your installation condition, you need a higher-rated enclosure shell around the module.

On the procurement side, typical lead time from distributor stock runs 1–5 days when in stock; direct Siemens order is 2–4 weeks. Minimum order quantities of 5 units are common on direct orders, though major global distributors typically supply single units. If you are working against a production restart deadline and stock is uncertain, contacting LeadTime.ca to confirm availability before committing to a build schedule is the right move. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

The following points cover the key requirements and checks for wiring and installing the 3SU1400-1AA10-1BA0. For full installation procedures, refer to the Siemens SIRIUS ACT 3SU1 operating instructions document supplied with the product or available on the Siemens Industry Mall.

  • Terminal acceptance: Screw terminals accept solid copper conductors 0.5–1.5 mm² without ferrules, or 2x 0.5–0.75 mm² with ferrule end processing; oversized wire without ferrule creates loose connection risk
  • Tightening torque: Apply 0.8–0.9 N-m to each screw terminal using a calibrated torque screwdriver — over-torquing cracks the terminal block; under-torquing causes intermittent contact after thermal cycling
  • Enclosure fit: The module inserts straight into the SIRIUS ACT 3SU1 22 mm enclosure cavity; align the module key and groove with the enclosure pocket before seating — do not force sideways
  • Inductive loads: For solenoid valves, contactor coils, or relay coils on the switched circuit, install RC suppression (0.47 µF / 100 ohm per contact) at the load terminals to prevent contact arcing and protect the 10,000,000-cycle life rating
  • Commissioning verification: After wiring and reassembly, confirm contact closure with a multimeter set to continuity between the two module terminals while the pushbutton is pressed before restoring load voltage

Compatible Modules and System Expansion Within SIRIUS ACT 3SU1

The SIRIUS ACT 3SU1 series supports modular stacking of up to 6 contact or LED modules per enclosure cavity, allowing compound switching logic without additional enclosure hardware. The following modules integrate directly with the same 22 mm enclosure cavity as the 3SU1400-1AA10-1BA0:

  • 3SU1400-1BA10-1BA0 — 2 NO contacts in a single module body; two independent switching channels for applications requiring dual confirmation signals
  • 3SU1400-1NC10-1BA0 — 1 NC (normally closed) contact; use in safety interlocking circuits requiring inverted logic or monitoring a de-actuated state
  • 3SU1300-1AB10-1CA0 — Single contact module with integrated red LED indicator; combines switching and status display in one cavity slot
  • 3SU1400-1BB10-1BA0 — Contact module with spring-return actuator configuration; suited to momentary-action control station designs

Note: SIRIUS ACT 3SU1 modules are compatible only within the SIRIUS ACT 3SU1 enclosure series. Mixing with non-Siemens enclosures or other Siemens 3S series (3S4, 3S7) is not supported due to differing cavity geometries and mechanical interfaces.

Wrong-Part Prevention Checklist Before You Order

Before placing an order for the 3SU1400-1AA10-1BA0, verify each of the following six points against your application requirements. These are the most common causes of wrong-part returns and project delays with this catalog number:

  1. Confirm your control station has a SIRIUS ACT 3SU1 series plastic or metal enclosure base; non-compatible with other Siemens 3S series (3S7, 3S4)
  2. Verify you need exactly 1 NO contact, not 2 NO, 1 NC, or mixed; contact stacking not possible once assembled
  3. Check screw-terminal conductor cross-section requirement (solid 0.5–1.5 mm² per contact); crimp lugs and oversized wire need separate ferrules
  4. Confirm operating voltage is within 5–500 VAC/VDC range at 50/60 Hz; not suitable for DC pulsed or rectified high-ripple supplies
  5. Ensure enclosure mounting method matches product (front-plate snap-in or screw-retain); rear-mounted variants use different catalog codes
  6. Verify inventory stock status; minimum order quantity often 5 units; lead time typically 2–4 weeks in North America

If any of the above points do not match your application, contact the LeadTime.ca team to confirm the correct variant before ordering — we can cross-reference your requirements against the full SIRIUS ACT 3SU1 range.

Frequently Asked Questions

Can I mix the 3SU1400-1AA10-1BA0 with Eaton M22 or Schneider Harmony contact modules in the same enclosure?

No. The SIRIUS ACT 3SU1 enclosure cavity is dimensionally and mechanically specific to the 3SU1 module family. Eaton M22, Schneider Harmony XB4, and other brands use proprietary cavity geometries that are not interchangeable with SIRIUS ACT enclosures. Substituting a different brand requires replacing the entire enclosure assembly and re-qualifying the mechanical interface.

What is the practical difference between the 3SU1400-1AA10-1BA0 and the 3SU1400-1BA10-1BA0?

The 3SU1400-1AA10-1BA0 has one contact element — one NO switch, two terminals. The 3SU1400-1BA10-1BA0 has two contact elements stacked — two independent NO switches, effectively six terminals in the same module body. If your circuit requires two separate NO outputs from a single pushbutton actuation (for example, one to a PLC input and one to a contactor coil), the 3SU1400-1BA10-1BA0 is the correct part. The 1 NO version cannot be field-reconfigured to add a second contact after assembly.

Can the 3SU1400-1AA10-1BA0 be used at 500 V to control a motor directly?

No. At 500 V, the contact is rated for 1.4 A (AC-14), which is suitable only for pilot-level signals such as contactor coil control or PLC inputs. Direct motor switching at 500 V requires a contactor sized for the motor load. The 10 A rating applies at 24–110 V AC; current capacity reduces significantly above 230 V.

Does the 3SU1400-1AA10-1BA0 include overload or short-circuit protection?

No. The module is a passive switching element with no active protection. Overload and short-circuit protection must be provided externally by a fuse, circuit breaker, or thermal overload relay installed in series with the downstream load. This is standard practice for all control contact blocks in this product category.

How do I confirm my existing control station uses SIRIUS ACT 3SU1 modules before ordering?

Check the enclosure nameplate, original panel documentation, or the module body itself for the SIRIUS ACT 3SU1 designation. The standard enclosure cavity diameter is 22 mm and the module body is typically black. If no documentation is available, measure the enclosure cavity diameter — SIRIUS ACT 3SU1 is 22 mm. If uncertain, photograph the existing module and enclosure and send the image to the LeadTime.ca team for confirmation before ordering.

What certifications does the 3SU1400-1AA10-1BA0 carry?

The module carries RoHS compliance (no restricted substances), EU CE declaration of conformity, UK declaration of conformity, CCC (China Compulsory Certification), CSA (Canadian Standards Association), UL (Underwriters Laboratories), and VDE certifications. It is compliant with IEC 61346-2 functional designation standards. These cover the primary markets in North America, Europe, and Asia where SIRIUS ACT control stations are deployed.

Why Order From LeadTime.ca

  • Ships worldwide — no geographic restrictions on order destination; export documentation handled at checkout
  • Sourcing support for hard-to-find variants and low-stock catalog numbers in the SIRIUS ACT 3SU1 family
  • Volume pricing available on multi-unit orders — contact the team directly for project-quantity quotes
  • Fast response on RFQs for lead-time-critical procurement before you commit to a build schedule

At-a-Glance Summary

  • Contact configuration: 1 NO (normally open), silver-alloy contact material, passive switching element
  • Operating voltage: 5–500 V AC/DC, 50/60 Hz; current rating 10 A at 24–110 V AC, 8 A at 230–400 V AC, 1.4 A at 500 V AC
  • Insulation voltage: 500 V AC test / 600 V rated; surge voltage 6 kV per IEC 60068-2-5
  • Mechanical and electrical service life: 10,000,000 operating cycles each
  • Screw-terminal wiring: Solid copper 0.5–1.5 mm²; tightening torque 0.8–0.9 N-m
  • Enclosure fit: 22 mm SIRIUS ACT 3SU1 series only (plastic or metal); front-plate mounting; IP40 enclosure / IP20 terminals
  • Ambient temperature: -25 to +70 °C; vibration rated 10–500 Hz, 5 g per IEC 60068-2-6
  • Module dimensions: 9.8 mm W × 33.2 mm H × 27.7 mm D
  • Certifications: RoHS, CE, UKCA, CCC, CSA, UL, VDE, IEC 61346-2
  • Typical lead time from distributor stock: 1–5 days; direct Siemens order: 2–4 weeks