SIEMENS RMS-TSIG-TZ-C Static Trip Module | Replacement, Equivalent & Selection Guide
The SIEMENS RMS-TSIG-TZ-C is a Static Trip Module designed for use within Siemens SENTRON series air circuit breakers and power distribution systems. It provides electronic overcurrent protection, replacing traditional thermal-magnetic trip mechanisms with a precision solid-state unit that delivers consistent, programmable protection across a wide range of industrial applications.
Buyers searching for an RMS-TSIG-TZ-C replacement or a compatible equivalent module often face challenges in identifying drop-in substitutes versus functional alternatives. This guide is designed to help engineers, procurement specialists, and maintenance teams make an informed selection — whether sourcing an original unit, a direct replacement, or a cross-brand equivalent — while avoiding costly compatibility errors.
Technical Specifications
- Manufacturer: Siemens AG
- Part Number: RMS-TSIG-TZ-C
- Module Type: Static Trip Unit (Electronic Overcurrent Release)
- Compatible Breaker Series: Siemens SENTRON 3WL / 3WT Air Circuit Breakers
- Protection Functions: Long-time (L), Short-time (S), Instantaneous (I), Ground fault (G) — configuration dependent
- Rated Current Range: Per host breaker frame rating (consult nameplate)
- Communication Interface: Dependent on variant suffix (TZ-C indicates specific communication/zone-selective interlock capability)
- Mounting: Plug-in module, integrated into breaker front panel
- Operating Temperature: -25°C to +70°C
- Standards: IEC 60947-2, UL 489 (where applicable)
- Weight: Approx. 1,600 g (including packaging)
- ⚠️ Key replacement decision parameters: breaker frame series, rated current, protection function set, and communication protocol must all match.
Compatible Replacement & Equivalent Models
1. Direct Drop-in Replacements
The following Siemens part numbers are confirmed or likely direct replacements for the RMS-TSIG-TZ-C, subject to breaker frame and firmware version compatibility:
- RMS-TSIG-TZ-C (OEM original — always the safest choice)
- Siemens ETU variants within the same 3WL/3WT series with matching suffix codes
- Prerequisite: Confirm breaker serial number and frame rating before substituting any ETU variant.
2. Functional Equivalents
These units offer equivalent protection functions but may require parameter re-configuration or firmware update:
- Siemens ETU25B, ETU45B, ETU76B — depending on required protection functions (L/S/I/G)
- Siemens RMS-TSIG series with alternate suffix (verify zone-selective interlock compatibility)
- Note: Functional equivalents may not be plug-and-play; commissioning by a qualified engineer is recommended.
3. Cross-Brand Alternatives
For applications where Siemens OEM parts are unavailable or cost-prohibitive, the following cross-brand alternatives may be evaluated:
- ABB EKIP series electronic trip units (for ABB Emax/Emax2 breakers — not a direct substitute; requires breaker replacement)
- Schneider Electric Micrologic trip units (for Masterpact series — cross-brand, system-level change required)
- Eaton IQ series trip units (for Eaton breaker platforms)
- ⚠️ Cross-brand alternatives are NOT drop-in replacements. A full system compatibility assessment is mandatory. Contact Konmask for guidance before ordering.
Why Choose the Original RMS-TSIG-TZ-C
- Precision Protection: Factory-calibrated trip curves ensure accurate overcurrent response within IEC 60947-2 tolerances — critical for arc flash and equipment protection.
- OEM Certification: Fully certified and tested by Siemens for use in SENTRON 3WL/3WT breakers; maintains UL/CE compliance of the host breaker.
- Seamless Compatibility: Plug-in design eliminates wiring errors and ensures correct communication with Siemens PROFIBUS/PROFINET infrastructure.
- Zone-Selective Interlock (ZSI): The TZ-C suffix confirms ZSI capability, enabling coordinated protection across multiple breaker tiers — a feature not universally available in substitutes.
- Manufacturer Warranty: Sourcing the original preserves Siemens warranty coverage and simplifies liability in the event of a fault.
- Technical Support: Konmask provides pre-sales compatibility verification and post-sales technical support for all OEM units supplied.
Typical Applications
- Power Distribution Panels: Main and sub-main incomer protection in MV/LV switchgear rooms of industrial plants.
- Oil & Gas Facilities: Upstream/downstream process control panels requiring zone-selective interlock for selective fault isolation.
- Automotive Manufacturing: Press lines and robotic welding cells where precise short-circuit coordination prevents production downtime.
- Data Centers: Critical power distribution units (PDUs) requiring high-precision ground fault protection and remote monitoring.
- Water Treatment Plants: Motor control centers (MCCs) for pump and blower drives with demanding duty cycles.
- Steel & Metals Processing: Rolling mill and furnace power distribution where high fault currents demand robust static trip performance.
System Compatibility
The RMS-TSIG-TZ-C is designed to operate within the Siemens SENTRON ecosystem. Verified compatible components include:
- Siemens 3WL Air Circuit Breakers — Host breaker platform (frame 1–4, 630A–6300A)
- Siemens 3WT Air Circuit Breakers — Legacy platform compatibility (verify suffix)
- SENTRON PAC Measuring Devices — Power monitoring integration via communication module
- PROFIBUS DP / PROFINET IO Modules — For remote parameter setting and diagnostics
- Siemens SIVACON S8 Switchgear — Integrated panel system compatibility
- Zone-Selective Interlock (ZSI) Bus — Upstream/downstream breaker coordination wiring
Selection Guide
Before ordering, confirm the following three criteria to ensure correct fitment:
- Is your host breaker a Siemens 3WL or 3WT series? The RMS-TSIG-TZ-C is designed exclusively for these platforms. If your breaker is from a different manufacturer or series, a cross-brand assessment is required — contact Konmask before purchasing.
- Does your application require Zone-Selective Interlock (ZSI)? The TZ-C suffix confirms ZSI support. If ZSI is not required, an alternative ETU variant may offer cost savings. If ZSI is mandatory, do not substitute with a non-TZ variant.
- What is your breaker’s rated current and required protection functions (L/S/I/G)? Provide your breaker nameplate data and existing ETU settings to Konmask — our team will verify compatibility and advise on the correct replacement within 24 hours.
📩 Not sure which model fits your system? Contact Konmask at support@konmask.com or +0086 19859288691 for a free compatibility check.
Quality Assurance & Sourcing
Konmask sources the RMS-TSIG-TZ-C through verified industrial supply channels, including authorized distributors and certified secondary market suppliers. Every unit undergoes a 4-step inspection process before dispatch:
- Visual & Physical Inspection: Housing integrity, label authenticity, connector condition, and absence of counterfeit indicators.
- Functional Bench Test: Power-on verification and communication interface check where test equipment is available.
- Documentation Review: Cross-referencing part number, date code, and country of origin against supplier records.
- Packaging & Serialization: Anti-static packaging, tamper-evident sealing, and shipment tracking assignment.
Available documentation upon request: Test reports, Certificate of Conformity (CoC), Material Safety Data Sheet (MSDS), and customs/export documentation.
How to Order
- Submit Your Inquiry: Email support@konmask.com or call +0086 19859288691 with your part number, required quantity, and delivery timeline.
- Receive Quotation & Compatibility Confirmation: Konmask will respond within 24 hours with pricing, lead time, and a compatibility verification note.
- Confirm & Ship: Upon order confirmation, units are prepared, inspected, and dispatched with full tracking and documentation.
Replacement & Compatibility FAQ
Q1: Can I use a Siemens ETU45B to replace the RMS-TSIG-TZ-C?
The ETU45B is a functional equivalent within the 3WL series for L/S/I/G protection, but it does not support Zone-Selective Interlock (ZSI). If your system uses ZSI coordination, the ETU45B is not a suitable substitute for the RMS-TSIG-TZ-C. Confirm your ZSI requirements before selecting a replacement.
Q2: Is the RMS-TSIG-TZ-C compatible with older 3WT breakers?
Compatibility with 3WT legacy breakers depends on the specific frame generation and firmware version. The RMS-TSIG-TZ-C is primarily designed for 3WL platforms. Contact Konmask with your 3WT breaker serial number for a definitive compatibility assessment before ordering an equivalent or substitute unit.
Q3: Are there equivalent static trip modules from ABB or Schneider Electric that can substitute the RMS-TSIG-TZ-C?
ABB EKIP and Schneider Micrologic units are functional equivalents in terms of protection philosophy, but they are not cross-brand drop-in substitutes — they are designed for their respective breaker platforms (ABB Emax, Schneider Masterpact). Substituting with these alternatives requires replacing the host breaker as well. Konmask recommends sourcing the original Siemens RMS-TSIG-TZ-C or a verified Siemens-compatible equivalent to avoid system-level changes.
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