Siemens 3RT2016-1BB41 — 9 A Power Contactor Buying Guide

By Abdullah Zahid
12 min read
Siemens 3RT2016-1BB41 S00 frame 3-pole 24V DC power contactor for three-phase motor control

Siemens 3RT2016-1BB41 Power Contactor — 9 A, 24 V DC, AC-3 Specifications, Wiring Overview & Alternatives

When a controls engineer or panel builder searches for the Siemens 3RT2016-1BB41 by exact catalog number, the decision is usually nearly made. The remaining questions are specific: is the 9 A AC-3 rating adequate for the load, does the 24 V DC coil match the available control supply, and is stock available fast enough to meet the build schedule? This article answers all three directly, using verified specifications from Siemens and practical sourcing context from LeadTime.ca. The 3RT2016-1BB41 is a 3-pole power contactor in the compact S00 frame, rated for 9 A at AC-3 duty up to 690 V AC, with a 24 V DC coil and one normally-open auxiliary contact for PLC feedback or interlocking logic.

If you have already confirmed this is the correct part, check current pricing and availability for the 3RT2016-1BB41 at LeadTime.ca — ships worldwide.

Who Should Buy the 3RT2016-1BB41 — and Who Shouldn't

The 3RT2016-1BB41 is the right contactor when your system meets all of the following criteria:

  • Your control supply is 24 V DC — not 24 V AC, 110 V AC, or 230 V AC
  • Your three-phase load draws 9 A or less at AC-3 duty (motor starting or inductive switching)
  • You need a 3-pole configuration for three-phase motor or load control
  • Your distribution voltage does not exceed 690 V AC maximum switching voltage
  • A single normally-open auxiliary contact is sufficient for your feedback and interlocking logic

If your load current exceeds 9 A, step up to the 3RT2016-2BB41 at 16 A. If you need more auxiliary contact positions — such as 2 NO + 2 NC for complex interlocking — the 3RT2016-2BB42 is the correct variant. If your coil supply is AC, verify the suffix code carefully before ordering.

On this page:

What the 3RT2016-1BB41 Actually Does in a Control Panel

The 3RT2016-1BB41 is a power contactor from the Siemens SIRIUS family — specifically, a 3-pole electromagnetic switching device that opens and closes three main power contacts simultaneously when a 24 V DC control signal is applied to the coil. Its primary job is remote on/off control of three-phase motors, resistive heaters, and inductive loads in industrial machinery, replacing manual knife switches with automated switching that a PLC output or relay can command.

Rated at 9 A under AC-3 duty at 400 V — the standard duty cycle for squirrel-cage motor starting — the contactor delivers 4 kW of operating power at 400 V and 5.5 kW at 690 V. It is not a circuit breaker and carries no integral overload protection. External upstream protection via a 16 A C-curve MCB or a 10–13 A time-delay fuse is required. What the 3RT2016-1BB41 adds that a fuse cannot is controllability: the ability to switch the load repeatedly, under automation control, for up to 30 million mechanical cycles across its service life. In a machine running 100 switching operations per hour over 250 working days per year, that translates to approximately 10–15 years before wear-based replacement becomes relevant.

The single normally-open auxiliary contact is a parallel signaling path. It closes when the coil is energized, providing a status signal back to a PLC input card or turning on an indicator lamp — confirming that the contactor has actually closed, not just that the command was issued. This is the feedback link that makes automated motor management reliable rather than assumed.

Where the 3RT2016-1BB41 Sits in a Typical Motor Control Circuit

The 3RT2016-1BB41 sits between the upstream overcurrent protection device and the motor terminals, acting as the electronically controllable switch in the power path. Here is the typical component chain:

  • Three-phase supply enters a 16 A C-curve MCB or upstream fuse for short-circuit protection of the main circuit
  • Switched output from the MCB feeds the three main input terminals (L1, L2, L3) of the 3RT2016-1BB41
  • The three main output terminals (T1, T2, T3) connect to motor leads (U, V, W) or load terminals
  • A 24 V DC PLC output — or relay contact — drives the contactor coil, closing all three main contacts simultaneously
  • The 1 NO auxiliary contact returns a run-status signal to a PLC input or indicator, confirming contactor closure

Typical Applications: Motors, Heaters, and Interlocked Systems

The most common deployment for the 3RT2016-1BB41 is as a direct-on-line starter for three-phase induction motors rated 4–5 kW at 400 V. This covers a wide range of small industrial machinery: centrifugal pumps, fans, compressors, and conveyor drives where full-voltage starting is acceptable and the load current stays at or below 9 A at AC-3 duty.

In thermal process equipment — industrial ovens, drying chambers, and heating systems — the contactor switches resistive heater banks at AC-1 duty, where its 22 A AC-1 rating at 400 V gives substantial headroom beyond the AC-3 figure. Programmable temperature controllers or PLC analog outputs drive the coil to cycle heat on and off against a setpoint.

The 3RT2016-1BB41 is also well suited to soft-start bypass duty. After a soft-starter has ramped a motor to full speed, a bypass contactor closes in parallel with the soft-starter's thyristors, eliminating heat dissipation through the semiconductors during steady-state running. At 9 A, the contactor handles motors up to the 4 kW limit in this role.

For dual-motor standby systems — primary pump running, standby pump held off — the auxiliary contact provides the interlocking feedback. When the primary contactor's auxiliary contact is closed and signaling the PLC, the logic inhibits the standby circuit. If the primary drops out, the standby is released. This pattern is common in water treatment, HVAC plant rooms, and process industry pump skids.

Application Typical Deployment
Three-phase pump or fan starter Direct-on-line starter, 4–5 kW motor, PLC-controlled, 24 V DC coil supply
Industrial heater switching Resistive load at AC-1 duty, temperature controller output drives coil
Soft-start bypass contactor Closes after ramp-up complete, reduces semiconductor heat dissipation at full speed
Dual-pump standby interlock Auxiliary contact feeds PLC input; logic prevents simultaneous energization
Conveyor drive control PLC output energizes coil; contactor switches motor in machine tool or packaging line
HVAC compressor switching Building automation controller drives 24 V DC coil; status fed back to BMS via auxiliary contact

Key Specifications: What You Need to Make the Purchase Decision

Parameter Value
Main Contacts 3-pole, 3 NO
Contact Rating — AC-3 @ 400 V 9 A / 4 kW
Contact Rating — AC-3 @ 690 V 6.7 A / 5.5 kW
Contact Rating — AC-1 @ 400 V, 40°C 22 A
Maximum Switching Voltage 690 V AC
Coil Voltage 24 V DC
Auxiliary Contacts 1 NO
Mechanical Service Life 30,000,000 cycles
Max Operating Frequency (AC-3) 750 cycles/hour
Frame Size / Terminal Style S00 / Screw terminal

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

3RT2016-1BB41 vs. Other SIRIUS Variants — Which One Do You Actually Need?

Model Rated Current (A) Coil Voltage Auxiliary Contacts Frame Size Price Tier Best For
3RT2016-1BB41 9 24 V DC 1 NO S00 Baseline Small motors, standard duty, 4 kW at 400 V
3RT2016-2BB41 16 24 V DC 1 NO S00 +15% Motors 7–11 kW, higher load current
3RT2016-2BB42 16 24 V DC 2 NO + 2 NC S00 +20% Complex interlocking logic requiring more auxiliary contacts
3RT2015-1BB41 9 24 V DC 1 NO S00 -5% Legacy systems or retrofit where older stock is available
ABB A16 9 24 V DC 1 NO Compact -10% Cost-sensitive projects within existing infrastructure — note: terminal layout differs
Eaton DILM7 7 24 V DC 1 NO S00 -20% Budget, non-critical applications where 7 A is sufficient

The 3RT2016-1BB41 is the correct choice when your control architecture is built around 24 V DC logic, your load is at or under 9 A AC-3, and you are working within the Siemens SIRIUS ecosystem where panel footprint and mounting interfaces are already established. If your load current exceeds 9 A, the 3RT2016-2BB41 is the direct upgrade within the same S00 frame — check current availability and pricing at LeadTime.ca and contact the team if you need a variant confirmation.

Expert Verdict: Honest Assessment for Engineers and Procurement Specialists

The 3RT2016-1BB41 earns its place in panel builders' standard parts lists for two concrete reasons: the S00 frame size fits into tight DIN rail layouts where larger contactors would force a panel redesign, and the 30 million cycle mechanical life rating means that in moderate-duty applications — 100 operations per hour, 250 working days per year — this contactor is unlikely to wear out within the service life of the machine it controls. For a 4 kW three-phase motor starter with a 24 V DC PLC output available, this is a well-matched, low-risk specification. The screw terminal version suits standard panel wiring practice and does not require special tooling.

The honest limits are straightforward. At 9 A AC-3, the margin disappears quickly if motor selection changes during the project. A motor with 10 A or 11 A full-load current requires the 3RT2016-2BB41 — ordering the 1BB41 as a cost save on a borderline load will reduce contact life dramatically through increased arcing at each break. The single 1 NO auxiliary contact also becomes a constraint in more complex interlocking schemes; if your logic needs two feedback paths or a normally-closed contact for a safety interlock, you need the 3RT2016-2BB42 with its 2 NO + 2 NC auxiliary configuration. Neither limitation is a design flaw — they are the natural consequence of a contactor correctly optimized for the S00 frame size and 9 A rating. Know your load before committing the part number.

From a procurement standpoint, the 3RT2016-1BB41 carries a 5-day ex-works lead time from Siemens and is stocked by authorized distributors worldwide. LeadTime.ca maintains sourcing access to the full SIRIUS contactor range and can advise on volume pricing for orders of 10 or more units. If your build schedule is tight, ordering from distributor stock rather than direct avoids the ex-works lead time window. If this contactor fits your verified system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing, project quantities, or lead time confirmation before locking in a BOM, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

The following points cover what engineers need to verify before and during installation. For complete wiring procedures and torque values, refer to the Siemens SIRIUS installation documentation for the 3RT2016 series.

  • Main contact terminals accept 4–16 mm² wire (AWG 20–14); minimum 4 mm² is recommended for AC-3 duty at rated current — dual-wire connections are supported using two parallel conductors per terminal where the panel design requires it
  • Auxiliary contact terminals accept 0.5–2.5 mm² or up to 4 mm² for signaling circuits; use fine-stranded or single-stranded wire depending on the run and terminal type
  • The 24 V DC coil supply wires should be 1.5–2.5 mm² (AWG 18–14); keep coil runs short and ensure the supply can hold above 18 V DC under all load conditions — voltage sags below this threshold cause dropout
  • External upstream overcurrent protection is mandatory — a 16 A C-curve MCB or 10–13 A time-delay fuse upstream of the main terminals protects both the contactor and the load circuit; the 3RT2016-1BB41 has no integral breaker
  • S00 frame requires 10 mm minimum spacing on all sides (forward, upward, and downward) when mounted adjacent to other devices; side-by-side spacing to another S00 contactor is 0 mm, allowing direct adjacency on the DIN rail

Wrong-Part Prevention: Six Checks Before You Confirm the Order

Before finalizing your purchase of the 3RT2016-1BB41, run through this checklist verbatim — each item corresponds to a real ordering mistake engineers make with this part number:

  1. Verify coil voltage is 24 V DC, not 24 V AC or other standard voltages (110 V AC, 230 V AC)
  2. Confirm contact rating 9 A matches or exceeds your load current at the correct voltage (400 V, 500 V, or 690 V)
  3. Check that AC-3 or AC-3e duty cycle matches your load type (motors, inductive loads, not resistive-only)
  4. Ensure 1 NO auxiliary contact meets your signaling and feedback logic requirements
  5. Verify screw terminal style is compatible with your wiring gauge and installation practice
  6. Confirm the S00 frame size physically fits your panel layout with 10 mm minimum spacing all sides

If any item on this list raises a question about fit, contact the LeadTime.ca team before ordering — or review the full specification details on the product page to cross-check against your design.

Frequently Asked Questions

Is the 3RT2016-1BB41 suitable for a 4 kW three-phase motor?

Yes, provided the motor is three-phase at 400 V AC and draws no more than 9 A full-load current at AC-3 duty. Check the motor nameplate current rating before confirming the contactor selection. If the nameplate current exceeds 9 A, the 3RT2016-2BB41 at 16 A is the correct next step within the same S00 frame. For 690 V supply, verify the motor is also rated for 690 V — the contactor is rated for 6.7 A AC-3 at that voltage.

What is the difference between AC-3 and AC-3e duty cycles on this contactor?

AC-3 is the standard duty cycle for switching inductive loads and squirrel-cage motor starting. AC-3e is an extended version with tighter control of inrush currents during the switching event. The 3RT2016-1BB41 is rated for both, and for the vast majority of motor starting applications the two ratings produce no practical difference in selection or operation. No special configuration is required to use either duty cycle.

Can the 3RT2016-1BB41 switch DC loads on the main contacts?

The contactor does carry DC switching ratings (DC-1, DC-3, DC-5, DC-12, DC-13) in its datasheet. As one example from the brief data, DC-1 at 24 V allows 20 A — however, DC current capability varies significantly by voltage and duty class, and is generally lower than the AC ratings at equivalent voltages. Always verify your specific DC load current and voltage against the published DC ratings before specifying this contactor for a DC main circuit application.

What is the lead time for the 3RT2016-1BB41 and how do I expedite if my schedule is tight?

Siemens publishes a standard lead time of 5 days ex-works for the 3RT2016-1BB41. Authorized distributors typically carry 2–6 weeks of stock, which means ordering from distributor inventory avoids the ex-works window entirely. If the 3RT2016-1BB41 is on back-order, the 3RT2015-1BB41 — same 9 A rating, same 24 V DC coil, S00 frame — is sometimes available in older distributor stock as a schedule fallback. Contact LeadTime.ca to check current availability before committing to a build schedule.

How do I verify I have received the correct part and not a 24 V AC variant?

Check the label on the contactor body: it must show "24 V DC" explicitly, not "24 V AC" or "24 VAC." Confirm the printed contact rating shows 9 A at AC-3 or equivalent, three main contacts, and 1 NO auxiliary contact. If the coil label shows any AC designation, the part is incorrect — a 24 V AC coil will not operate properly on a DC control supply and may overheat or fail to pull in. Measure the screw terminal pitch and compare to your panel wiring drawings as a final physical confirmation.

What upstream protection is required with the 3RT2016-1BB41?

The 3RT2016-1BB41 has no integral circuit breaker or overload relay. A 16 A C-curve MCB or a 10–13 A time-delay fuse must be installed upstream of the contactor's main terminals to provide short-circuit and overcurrent protection for both the contactor and the connected load. For motor protection, a separate overload relay matched to the motor's full-load current is also standard practice in a complete motor starter assembly.

Why Order the 3RT2016-1BB41 from LeadTime.ca

  • LeadTime.ca ships worldwide — no regional restriction on orders, with sourcing support for engineering teams in North America and internationally
  • Access to the full Siemens SIRIUS contactor range, including variant confirmation support when a direct alternative or higher-amperage model is needed
  • Volume pricing available for orders of 10 or more units — contact the team for project quantities before committing a BOM
  • Hard-to-find and short lead time parts sourced proactively — useful when distributor stock is depleted ahead of a build window
  • Direct response from application-knowledgeable staff, not an automated quote system

At-a-Glance Summary

  • 3RT2016-1BB41: 3-pole power contactor, S00 frame, screw terminals, Siemens SIRIUS family
  • Rated 9 A at AC-3 duty, 400 V AC — delivers 4 kW operating power; derated to 6.7 A at 690 V
  • 24 V DC coil voltage — not interchangeable with 24 V AC or other coil voltage variants
  • Maximum switching voltage: 690 V AC; insulation voltage rated 690 V
  • 1 NO auxiliary contact for PLC feedback, status indication, or interlocking logic
  • Mechanical service life: 30,000,000 cycles — approximately 10–15 years at 100 cycles/hour, 250 days/year
  • Maximum operating frequency: 750 cycles/hour at AC-3 duty
  • Net weight: 0.305 kg; dimensions 58 mm H x 45 mm W x 73 mm D; 10 mm minimum spacing required on all sides
  • Standard lead time: 5 days ex-works; distributor stock typically 2–6 weeks
  • External upstream protection required: 16 A C-curve MCB or 10–13 A time-delay fuse; no integral overload protection
  • Complies with IEC 60947-4-1; UL 508 listed; CE marked