Siemens 3rv2925-5ab

By Abdullah Zahid
11 min read
Siemens 3RV2925-5AB 3-phase supply terminal for SIRIUS S00 S0 busbar connection in motor control center panel

Siemens 3RV2925-5AB 3-Phase Supply Terminal for SIRIUS S00/S0 Busbar Connection: Specs, Feeder Options & Buying Guide

Controls engineers and procurement specialists searching for the Siemens 3RV2925-5AB are typically at the final stage of a BOM confirmation or panel build verification — they need to know the terminal accepts their conductor gauge, fits their SIRIUS frame size, and ships within their project window. The 3RV2925-5AB is a 3-phase supply terminal designed specifically for top-mounted busbar connection on SIRIUS S00 and S0 frame circuit breakers, rated at 63 A and 690 V AC, with screw-type main contacts accepting 2.5–25 mm² stranded conductors. It carries CE, UL, CSA, and CCC certifications simultaneously — one of the few passive busbar terminal accessories that clears all four major regulatory frameworks without requiring separate regional variants.

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

Who Should Buy the 3RV2925-5AB — and Who Shouldn't

The 3RV2925-5AB is the correct choice when all of the following are true for your application:

  • Your SIRIUS circuit breaker is frame size S00 or S0 — not S1, S2, S3, or larger
  • Your busbar system connects from the top of the breaker (not bottom or side entry)
  • Your conductor cross-section falls within 2.5–25 mm² for stranded wire, or 2.5–16 mm² for solid or finely stranded conductors with core-end processing
  • Your rated system voltage does not exceed 690 V AC and your installation current does not exceed 63 A
  • Your target market requires CE, UL, CSA, or CCC certification — this terminal holds all four

If your SIRIUS breaker is S1 frame or larger, or if your busbar enters from the bottom or side, this terminal will not fit. You will need a different model from the 3RV29xx family matched to your frame size and connection geometry — confirm the correct variant before ordering.

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What the 3RV2925-5AB Actually Does in a Control System

The 3RV2925-5AB is a passive electrical connector accessory — it provides no overcurrent protection, switching function, or trip mechanism of its own. Its sole role is to create a standardized, repeatable mechanical and electrical interface between a 3-phase busbar source and the top-mounted input terminals of a SIRIUS S00 or S0 frame molded case circuit breaker (MPCB). Without this terminal, connecting a 3-phase busbar to the breaker's top terminals requires custom conductor routing, which introduces variability in contact resistance, increases installation time, and raises the probability of connection error during assembly or maintenance.

The terminal uses screw-type main contacts, accepting stranded conductors from 2.5 mm² up to 25 mm², or solid and finely stranded conductors from 2.5 mm² to 16 mm² when core-end processed. The IP20 protection class (IEC 60529) provides finger-safe touch protection on the vertical front contact face. At 39 mm tall, 45 mm wide, and 27 mm deep, it integrates cleanly within the compact cabinet footprint typical of S00 and S0 installations.

For system integrators building UL 508E self-protected combination motor controller assemblies, the 3RV2925-5AB's UL 508 listing is a meaningful specification — it means the terminal has been evaluated as part of a self-protected MPCB assembly configuration, which eliminates a field validation step that unvalidated accessories would require.

Where the 3RV2925-5AB Sits in a Typical System

The 3RV2925-5AB occupies the connection point between the incoming 3-phase busbar and the line-side input of the SIRIUS S00 or S0 circuit breaker — it is the first mechanical interface in the circuit protection chain downstream of the busbar source.

  • 3-phase power source (utility feed, transformer secondary, or generator output) connects to the main busbar
  • The 3-phase busbar distributes power horizontally across the motor control center or switchgear row
  • The 3RV2925-5AB mounts to the top of each SIRIUS S00 or S0 breaker, forming the tap-off connection from the busbar to the breaker line terminals (L1, L2, L3)
  • The SIRIUS circuit breaker provides overcurrent and short-circuit protection downstream of the terminal
  • Load-side cables exit the breaker's bottom terminals to contactors, motor starters, or direct motor loads

Which Industries and Machine Types Use This Terminal

New motor control center builds represent the most common deployment context. OEM panel builders specify SIRIUS S00 and S0 breakers as individual circuit protection elements within a busbar-fed MCC row, and the 3RV2925-5AB provides the repeatable, factory-assembled tap connection for each breaker position. Standardizing on this terminal across all positions in a panel reduces assembly time and ensures consistent contact geometry.

Retrofit and upgrade projects are the second major use case. When a facility replaces an aging circuit breaker with a SIRIUS S00 or S0 unit in an existing busway system, the 3RV2925-5AB enables fast installation without rewiring the busbar — the terminal adapts the existing busbar geometry to the new breaker's top-entry connection format.

In self-protected MPCB assembly builds for UL 508E compliance, the terminal's UL listing as part of a combination motor starter assembly (contactor + breaker + protection relays) is operationally significant. System integrators specify it explicitly to satisfy panel shop inspection requirements and avoid certification delays.

Renewable energy applications — solar inverter output protection and wind turbine yaw or pitch control panels — increasingly use SIRIUS circuit protection with busbar architecture. The 3RV2925-5AB connects the 3-phase inverter output busbar to the SIRIUS bypass protection breaker before the main disconnect, supporting designs where connection density and physical space are constrained.

Application Typical Deployment
New motor control center build SIRIUS S00/S0 breakers with busbar infeed; terminal connects 3-phase mains to breaker array at each position
Retrofit or upgrade Replacement of older breaker in existing busway; terminal enables fast top-entry connection without busbar rework
UL 508E self-protected MPCB assembly System integrator designs combination motor starter; terminal satisfies UL assembly code requirements
Renewable energy tie-in Solar or wind inverter output fed through 3-phase busbar; terminal connects to SIRIUS bypass protection
Machine-mounted control cabinet Compact automation cabinet on machine frame; terminal reduces connection footprint and improves maintainability

Electrical and Physical Specs Engineers Need Before Ordering

Parameter Value
Maximum Ampacity 63 A
Rated Voltage AC 690 V
Conductor Cross-Section (Stranded) 2.5–25 mm²
Conductor Cross-Section (Solid / Finely Stranded) 2.5–16 mm²
Equivalent AWG Range 10–4 AWG
Terminal Type Screw-type main contacts
Protection Class (Front) IP20 (IEC 60529), finger-safe vertical front contact
Dimensions (H x W x D) 39 mm x 45 mm x 27 mm
Weight 0.047 kg
Operating Temperature Range -20 to +60°C

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

3RV2925-5AB vs. Other SIRIUS Feeder Terminals: Which One Do You Need?

The 3RV29xx family covers multiple frame sizes and busbar entry orientations. The table below maps the key selection variables that determine which terminal is correct for a given installation.

Model Frame Size Busbar Entry Conductor Range (Stranded) Select When
3RV2925-5AB S00, S0 Top 2.5–25 mm² S00/S0 breaker, busbar feeds from top
3RV2925-1AA S00, S0 Alternative top-mount variant Per variant datasheet Confirm connection geometry against schematic
3RV2925-1AB S00, S0 Alternative top-mount variant Per variant datasheet Confirm connection geometry against schematic
3RV29xx-xAx (larger frames) S1, S2, S3+ Varies Per frame-specific datasheet SIRIUS breaker is S1 or larger — do not use 3RV2925-5AB

If your SIRIUS circuit breaker nameplate confirms S00 or S0 and your busbar enters from the top, the 3RV2925-5AB is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Verdict: Is This the Right Busbar Terminal for Your Build?

The 3RV2925-5AB earns its place on a BOM because it removes three sources of installation variability at once: it standardizes the busbar-to-breaker interface geometry, pre-validates the connection for UL 508, CSA, CE, and CCC compliance in a single SKU, and fits within the compact spatial envelope of S00 and S0 installations. For OEM panel builders running multiple SIRIUS S00/S0 positions across a busbar row, using this terminal consistently across all positions reduces technician training overhead and lowers connection error rates compared to custom-wired approaches. The 0.047 kg weight and 39 mm x 45 mm x 27 mm footprint reflect genuine compactness for a 63 A, 690 V rated component.

Where this terminal does not work: any SIRIUS circuit breaker larger than S0 frame, any busbar architecture where power enters from the bottom or side, and any application requiring solid or finely stranded conductor sizes above 16 mm². These are hard mechanical and electrical constraints — there is no workaround that preserves safe, code-compliant installation. If your application falls into any of these categories, the correct action is to identify the matching 3RV29xx variant for your frame size and connection orientation before ordering.

On the procurement side, the 3RV2925-5AB is a standard catalog item in the SIRIUS accessories family, distributed globally through authorized channels. Lead times of 1–3 weeks are typical for in-stock supply; special orders or regional gaps may extend to 4–8 weeks. The multi-certification status (CE, UL, CSA, CCC) means global project teams do not need to manage separate terminal part numbers by region — one SKU covers North America, the EU, and China simultaneously, which simplifies global BOM management. 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 summarize the key requirements for installing the 3RV2925-5AB. Full wiring procedures and torque specifications are detailed in the Siemens installation manual for the 3RV2925-5AB and associated SIRIUS circuit breaker documentation.

  • Confirm the SIRIUS circuit breaker is de-energized and verified dead before any terminal handling; the IP20 protection class provides finger-safe contact protection but does not substitute for lockout/tagout procedures
  • Strip conductor insulation to the length specified in the installation manual; insert L1, L2, and L3 conductors into the screw-type main contacts, confirming conductor cross-section is within 2.5–25 mm² for stranded or 2.5–16 mm² for solid and finely stranded types
  • Tighten each screw terminal to the torque value specified in the manufacturer documentation — over-tightening compresses stranded copper and degrades clamping force over time; under-tightening causes resistive heating and intermittent trips
  • Verify mechanical seating of the terminal on the top-mounted connection points of the S00 or S0 breaker before applying conductor load; misalignment will prevent full electrical contact
  • After installation, measure phase-to-phase voltage symmetry and phase-to-earth resistance before applying full load; log results in the project commissioning record per UL 508 or CSA documentation requirements

What Engineers Get Wrong When Ordering This Part

The following checklist is drawn directly from the most common ordering and installation errors associated with the 3RV2925-5AB. Verify every item before placing a purchase order.

  1. Confirm SIRIUS circuit breaker frame size is S00 or S0 (not S1, S2, S3, or larger)
  2. Verify busbar connection is from top (not bottom or side entry)
  3. Check that conductor cross-section is within 2.5–25 mm² for stranded or 2.5–16 mm² for solid/finely stranded
  4. Confirm voltage rating is 690 V AC or lower
  5. Verify installation amperage does not exceed 63 A nominal capacity
  6. Ensure target market (Canada, USA, EU, China, etc.) aligns with held certifications: CE, UL, CSA, CCC
  7. Confirm this is a terminal/connector accessory purchase, not a circuit breaker or protective relay
  8. Check that application does not require auxiliary contacts or custom mounting brackets (separate SKUs)

If all eight checks pass, you have the right part. Order the 3RV2925-5AB at LeadTime.ca or contact the team to confirm stock before your project deadline.

Frequently Asked Questions

Can the 3RV2925-5AB be used with a SIRIUS S1 frame circuit breaker?

No. The 3RV2925-5AB is mechanically and electrically matched to SIRIUS S00 and S0 frame sizes only. Using it with an S1, S2, or S3 frame breaker will result in a physical fit failure — the terminal will not seat correctly on the larger breaker's connection points. Identify the correct 3RV29xx feeder terminal variant for your frame size before ordering.

Does the 3RV2925-5AB satisfy UL 508E self-protected combination motor controller assembly requirements?

Yes. The 3RV2925-5AB carries a UL 508 listing confirming its acceptability for use in self-protected MPCB assemblies. This means panel shops and inspectors evaluating a UL 508E combination motor starter that includes this terminal do not need to perform separate field validation of the terminal accessory — the listing is pre-established. Retain the product documentation and certification records for the commissioning file.

What is the maximum conductor size the 3RV2925-5AB will accept?

For standard stranded conductors, the maximum accepted cross-section is 25 mm² (approximately 4 AWG). For solid conductors or finely stranded conductors that have been core-end processed, the maximum is 16 mm². Attempting to insert a conductor larger than the rated cross-section will prevent proper terminal closure and create an unsafe connection. Verify your conductor gauge against these limits before installation.

Is the 3RV2925-5AB CSA certified for Canadian installations?

Yes. The 3RV2925-5AB holds CSA (Canadian Standards Association) certification, making it compliant for use in Canadian electrical installations governed by the Canadian Electrical Code (CEC). Authorized Siemens distributors in Canada stock SIRIUS accessories as standard items, with typical lead times of 2–3 weeks for in-stock supply.

Why does my circuit breaker trip intermittently after installing the 3RV2925-5AB?

The most common cause of intermittent tripping after terminal installation is a screw terminal that was not tightened to the specified torque. Thermal cycling during operation causes under-tightened connections to loosen further, increasing contact resistance and generating asymmetric heating across the three phases. Turn off and lock out power, inspect all three screw terminals, re-tighten to the torque value specified in the Siemens installation manual, and verify phase symmetry before restoring power.

What is the storage temperature range for the 3RV2925-5AB if ordered as a maintenance spare?

The 3RV2925-5AB can be stored at ambient temperatures between -50°C and +80°C without damage to the terminal or its contact materials. This wide storage range makes it suitable for spare-parts storage in outdoor equipment shelters or unheated warehouses in cold climates, provided the unit is kept dry and protected from physical damage.

Why Source the 3RV2925-5AB Through LeadTime.ca

  • LeadTime.ca ships worldwide — sourcing is not limited to any single country or region
  • Access to hard-to-find SIRIUS accessories, including variants with specific frame size or connection geometry requirements
  • Volume pricing available for OEM panel builders and procurement teams ordering multiple units per BOM
  • Direct contact with the team for lead time confirmation before project commitment — no waiting on automated stock pages
  • The 3RV2925-5AB's CE, UL, CSA, and CCC certifications are documented and available to support global project compliance requirements

At-a-Glance Summary

  • The Siemens 3RV2925-5AB is a 3-phase supply terminal for top-mounted busbar connection on SIRIUS S00 and S0 frame circuit breakers only
  • Rated at 63 A maximum ampacity and 690 V AC, with pollution degree 3
  • Accepts stranded conductors from 2.5–25 mm² and solid or finely stranded conductors from 2.5–16 mm² (AWG 10–4 equivalent)
  • Terminal type: screw-type main contacts; protection class IP20 (finger-safe, IEC 60529)
  • Physical dimensions: 39 mm (H) x 45 mm (W) x 27 mm (D); weight 0.047 kg
  • Certified CE, UL 508, CSA, and CCC — a single SKU covering North America, the EU, and China
  • Operating temperature range: -20 to +60°C; storage range: -50 to +80°C
  • Not compatible with S1, S2, S3, or larger SIRIUS frames — wrong frame size is the most common ordering error
  • Standard catalog item; typical in-stock lead time 1–3 weeks through authorized distributors worldwide
  • Environmental Product Declaration (EPD) certified; total global warming potential 139 kg CO2 eq over operational life