Siemens SIRIUS 3RA21 & 3RA22 2026: SEA Panel Shop Guide

Siemens SIRIUS 3RA21 and 3RA22 Compact Load Feeders in 2026: What Replaces the 3RA11 and 3RA12 for SEA Panel Shops

Your machine builder's purchase order lists "3RA1130-1FA21-0AP6" and your distributor says it is " NR " (no replenishment). The replacement shelf shows "3RA2115-0EA15-1AK6" — the same DIN-rail footprint, the same 3RT20 contactor base, but a different generation. Here's what changed, why it matters, and what your real sourcing options are for Southeast Asian panel shops in the second half of 2026.

The Market Situation (as of August 2026)

Siemens launched its new SIRIUS generation portfolio in April 2026, with a portfolio built around direct-current technology applications and improved sustainability credentials. The launch — described by Siemens as "groundbreaking" and covered by BDC Magazine on 15 April 2026 and Indian Chemical News on 16 April 2026 — signals a generational shift across the SIRIUS contactor, relay, and load-feeder range.

One direct consequence: the 3RA11 series (single-phase, standard DOL compact starters) and 3RA12 series (three-phase, standard DOL compact starters) that dominated SEA panel shop bills of materials from 2012 to 2022 are now formally in the Siemens end-of-life pipeline. The 3RA21 (DOL, 3-phase, 0.18–5.5 kW) and 3RA22 (reversing, 3-phase) series, launched in 2023 and refined through 2024, represent the direct functional replacement. Both are available from franchised distributors as of August 2026, though lead times on certain ratings above 4 kW have stretched to 14–20 weeks across major SEA franchised channels.

In parallel, Siemens expanded its semiconductor-based circuit protection portfolio in March 2026 (Siemens press, 5 March 2026), debuting a circular soft-starter design that overlaps in application space with the lower-power SIRIUS 3RT20 contactors that sit at the heart of 3RA21 and 3RA22 load feeders. This creates both substitution complexity and opportunity for panel builders who know where to look.

Demand for compact motor starters in Southeast Asia is being sustained by three concurrent drivers. First, the EU Ecodesign motor efficiency regulations (IE3/IE4 mandatory since July 2021 in EU, increasingly enforced in SEA export contracts) are forcing upgrades to higher-efficiency motors that require properly rated overload protection — the 3RB3 electronic overload relay inside a 3RA22 assembly is one of the most common ways to achieve this. Second, new data center construction across Singapore, Malaysia, and Thailand is driving concentrated demand for packaged HVAC and pump skids, where compact motor starters are a standard component. Third, SEA governments' industrial digitalization incentives (Thailand 4.0, Malaysia Smart Factory, Vietnam industrial automation push) are sustaining new machine builds that use SIRIUS components as the default motor control architecture.

What This Means for SEA Panel Shop Buyers

For panel shops that routinely spec Siemens SIRIUS for their motor control sections, the 3RA11-to-3RA21 transition is not optional — it is already underway at the distributor level. The practical consequences break down into three areas.

Availability timeline. Most franchised distributors in SEA have exhausted 3RA11 stock by Q2 2026. Remaining pipeline stock is fragmentary and price-disadvantaged. The 3RA21 series is in regular production but affected by the same semiconductor lead-time pressures that have impacted Siemens SIRIUS broadly since 2023. Ratings in the 4–5.5 kW range (3RT2026, 3RT2028 frame) are the most constrained, with 14–20 week quoted lead times as of August 2026. Lower ratings (0.37–2.2 kW, using 3RT2024 and 3RT2025 frames) are more readily available at 8–12 weeks.

Form-factor compatibility. The 3RA21 and 3RA22 use the same 45 mm module width per motor rating and the same DIN-EN 50022 rail mounting as the 3RA11/3RA12. The mechanical fit is identical — a panel builder swapping a failed 3RA1130 in an existing cabinet does not need to modify the DIN rail or wire routing. This mechanical compatibility is one of the strongest reasons to stick with the Siemens SIRIUS family rather than substituting a third-party combination.

Pricing delta. The 3RA21 generation carries a list-price premium of approximately 12–18% over the equivalent 3RA11 combination, driven by the redesigned 3RT20 contactor base (improved electrical endurance, AC-3 rated to 400 V without derating) and the new 3RB3 electronic overload relay interface. For a typical 7.5 kW motor starter assembly, that premium translates to roughly USD 18–32 at distributor level — modest for a new build, more noticeable when replacing multiple failed units in existing installations.

What's in Our Catalog / Replacement Options

As an independent industrial automation distributor carrying genuine Siemens SIRIUS inventory, we stock the following MPNs from the 3RA21 and 3RA22 family, all rated aiDemandScore 95 (key/premium tier) as of mid-2026:

3RA21 compact load feeders (DOL, three-phase):

3RA2115-0EA15-1AK6: 3RA21 with 3RT2024-1FB44 contactor + 3RB3113 overload, 5.5 kW at 400 V, AC-3, screw terminals. Id 838235, score 95.
3RA2120-1GA24-0AP6: 3RA21 with 3RT2026-1BM40 contactor + 3RB3113, 7.5 kW at 400 V, AC-3, spring-type terminals. Id 823101, score 95.

3RA22 compact load feeders (reversing, three-phase):

3RA2220-4DB27-0AP6: 3RA22 with two 3RT2026-2BB44 contactors + 3RB3113, 7.5 kW at 400 V, AC-3, screw terminals. Id 823131, score 95.
3RA2220-4EB27-0AP6: 3RA22 with two 3RT2026-1BM40 contactors + 3RB3113, 7.5 kW at 400 V, AC-3, spring-type terminals. Id 823099, score 95.

Core components (also available individually for service stock):

3RT2024-1FB44-3MA0: 3RT20 contactor, 3-pole, AC-3 9 A (4 kW/400 V), screw terminals, auxiliary 1NO+1NC. Id 838235, score 95.
3RT2026-2BB44: 3RT20 contactor, 3-pole, AC-3 17 A (7.5 kW/400 V), screw terminals, auxiliary 1NO+1NC. Id 837920, score 95.
3RT2026-1BM40: 3RT20 contactor, 3-pole, AC-3 17 A (7.5 kW/400 V), spring-type terminals, auxiliary 1NO+1NC. Id 837797, score 95.
3RT2028-1AC20: 3RT20 contactor, 3-pole, AC-3 25 A (11 kW/400 V), screw terminals, AC coil 220 V 50/60 Hz. Id 837797, score 95.
3RB3113-4PB0: 3RB3 electronic overload relay, 0.1–0.4 A setting range, Class 10, with manual/auto reset. Id 835689, score 95.
3RH2140-1AP00: 3RH2 coupling relay, 4-pole, 10 A AC-1, 230 V AC coil, plug-in. Id 837318, score 95.

These components can be ordered individually for service replacements or purchased as pre-assembled 3RA21/3RA22 units for new builds. The pre-assembled units ship with the contactor, overload relay, and mechanical coupling link pre-fitted, reducing panel assembly time by an estimated 20–30 minutes per starter compared to building the combination from individual components.

Substitution considerations: The SIRIUS 3RA21 cannot be directly substituted by Schneider Electric TeSys G / GV2 or ABB AF series without checking the motor rating and coordination type. The 3RA21 is rated for Type 2 coordination (IEC 60947-4-1) at 400 V AC-3 as a factory-tested combination. Third-party combinations that claim equivalent coordination must be independently verified. For export machines subject to IEC / UL inspection, always confirm the coordination test certificate matches the rating plate of the motor being protected.

Buying Advice: RFQ, Lead Times, Substitutes, and Authenticity

When to RFQ now versus when to wait. If your current build schedule runs past week 20 from today (late December 2026), you can afford to monitor distributor pipeline for the 8–12 week items (3RT2024 frame). If you have a delivery deadline before December 2026 on a 5.5 kW or 7.5 kW starter, place your RFQ this month — the 14–20 week lead time on the 3RT2026 frame means a missed August order becomes a January 2027 delivery risk.

Minimum order quantities. The 3RA21 and 3RA22 pre-assembled units are typically sold in box quantities of 1 at distributor level, with MOQ 1 for the individual 3RT20 contactors and 3RB3 overload relays we stock. For large projects (10+ starters), contact us for project pricing — we can typically secure allocation against confirmed PO at current list less 8–14% depending on volume and lead commitment.

Alternatives if Siemens allocation stretches. The primary alternative for DOL motor control in the 4–7.5 kW range is the Schneider TeSys G series ( Tesys GP) combined with a separate overload relay. This combination is mechanically larger (55–70 mm width per pole vs 45 mm for the 3RA21) and requires separate wiring of the overload contactor coil. It is widely stocked in SEA and typically available at 4–8 weeks. ABB's AF series with a BMet overload is the second alternative, with similar mechanical sizing to Schneider. Neither alternative offers the pre-tested Type 2 coordination certificate that the 3RA21 provides out of the box.

Authenticity verification. Genuine Siemens SIRIUS 3RT20 contactors are serialized and carry a QR code linking to the Siemens Industry Online Support (SIOS) portal for warranty registration. The 3RA21 and 3RA22 nameplates include the Siemens logo, the 3RA type designation, the rated power, and the IEC 60947-4-1 coordination type. Counterfeit 3RT20 contactors have appeared in SEA grey-market channels — they typically show a slightly different coil voltage marking (the genuine 3RT20 uses a single AC coil voltage; counterfeits sometimes show dual AC/DC marking), and the genuine unit's grey housing matches RAL 7035 exactly. When in doubt, verify the serial number at siemens.com/industry/online-support.

The Takeaway

The Siemens SIRIUS 3RA11 and 3RA12 are effectively end-of-life for new builds as of August 2026, with 3RA21 (DOL) and 3RA22 (reversing) as their direct replacements. For panel shops spec'ing Siemens motor control today, the 3RA21 and 3RA22 pre-assembled units offer the same DIN-rail fit, Type 2 coordination, and SIRIUS ecosystem compatibility — but the lead times on higher ratings require forward planning. RFQ your 5.5 kW and 7.5 kW units before the end of September 2026 to protect your Q4 delivery schedule, and verify authenticity through SIOS serial-number registration on receipt.