Siemens 3RU1136-4HB0 | Thermal Overload Relay 40-50A Class 10

Siemens 3RU1136-4HB0 — Lifecycle Excellence & Technical Performance

Operational Integrity & System Analysis

From the perspective of an Industrial Compliance Consultant, the Siemens 3RU1136-4HB0 represents a cornerstone component in maintaining the operational integrity of motor-driven systems across mission-critical industrial environments. Engineered to deliver Class 10 thermal overload protection within the 40-50A current range, the 3RU1136-4HB0 fulfills a decisive role in safeguarding rotating machinery against sustained fault conditions, phase imbalance, and thermal degradation — all of which are primary contributors to unplanned downtime and asset lifecycle reduction.

Within the framework of Industry 4.0 and evolving automation architectures, this component demonstrates long-term compatibility with SIRIUS modular system platforms, enabling seamless integration into both legacy installations and next-generation control panels. Its bimetal thermal sensing mechanism, calibrated to IEC 60947-4-1 compliance standards, ensures that system performance remains consistent across variable ambient conditions ranging from -25°C to +60°C — a critical attribute for facilities pursuing asset optimization across extended operational cycles.

As a certified original equipment component, the 3RU1136-4HB0 carries the full traceability and documentation chain required by regulated industries. Its factory-sealed condition upon delivery guarantees that no compromise has been made to its calibration integrity, making it the preferred choice for compliance-driven procurement strategies where safety integrity is non-negotiable.

Compliance & Safety Benchmarks

✅ IEC 60947-4-1 Certified: Fully compliant with international low-voltage switchgear and controlgear standards, ensuring global regulatory acceptance across EU, APAC, and North American markets.

✅ Class 10 Trip Characteristic: Adheres to standardized trip-time curves, providing predictable and auditable protection behavior for motor management documentation.

Phase Loss & Imbalance Detection: Continuous three-phase monitoring with automatic fault discrimination — a mandatory requirement under ISO 13849 functional safety assessments.

✅ IP20 Ingress Protection: Front-panel rated for standard control cabinet environments, with compatibility for additional enclosure-level protection in harsh-duty installations.

Thermal Memory Function: Retains accumulated thermal state across power cycles, preventing premature restart of thermally stressed motors — a critical safeguard for high-cycle duty applications.

✅ Original Documentation Included: Each unit ships with manufacturer-issued calibration records and compliance declarations, supporting audit-ready asset registers.

Vertical Industry Integration & Optimization

Semiconductor Manufacturing: In cleanroom environments where motor-driven vacuum pumps and HVAC systems operate continuously, the 3RU1136-4HB0 provides the deterministic protection behavior required to prevent contamination events caused by uncontrolled motor failures. Its precise trip repeatability supports process validation documentation under SEMI standards.

Pharmaceutical & Life Sciences: GMP-regulated facilities demand full component traceability and validated performance records. The original documentation supplied with each 3RU1136-4HB0 unit directly supports 21 CFR Part 11 and EU Annex 11 compliance frameworks, reducing qualification burden during equipment lifecycle reviews.

Chemical & Petrochemical Processing: In ATEX-adjacent control architectures, where motor protection must be both reliable and auditable, this relay’s standardized trip characteristics and manual reset capability ensure that fault investigation protocols are enforced before system restart — a key requirement under IEC 60079 safety management systems.

Water & Wastewater Infrastructure: Pump station operators benefit from the relay’s field-selectable automatic reset mode, enabling remote recovery of non-critical drives while maintaining manual override capability for primary process pumps — optimizing operational continuity without compromising safety integrity.

Comprehensive Engineering Specifications

Fulfillment Strategy & Technical Support

Factory Sealed Condition: Every 3RU1136-4HB0 unit is dispatched in its original manufacturer packaging with tamper-evident sealing, preserving calibration integrity and ensuring that the component arrives in a condition fully consistent with its factory acceptance test records.

Rapid Global Logistics: Our fulfillment infrastructure supports expedited international shipping to major industrial hubs across Asia-Pacific, Europe, the Middle East, and the Americas. Priority dispatch options are available for critical maintenance scenarios where extended downtime carries significant operational cost.

12-Month Quality Guarantee for Legacy Systems: We extend a 12-month quality assurance commitment on all 3RU1136-4HB0 units, covering verified defects in materials and manufacturing workmanship. This guarantee is specifically structured to support legacy system operators who require long-term component availability assurance as part of their asset lifecycle management strategy.

Technical Support: Our engineering support team provides application consultation, compatibility verification, and integration guidance — including assistance with contactor pairing, current setting calculation, and compliance documentation preparation for regulated industry installations.

Expert Technical FAQ

Q1: Does the 3RU1136-4HB0 comply with IEC 60947-4-1, and can this be verified through original documentation?
A: Yes. The 3RU1136-4HB0 is fully certified to IEC 60947-4-1, the international standard governing low-voltage motor starters and overload relays. Each unit is accompanied by original manufacturer documentation, including the declaration of conformity and CE marking records, which are directly usable in regulatory audit submissions and equipment qualification dossiers.

Q2: What are the environmental adaptability limits for installations in high-temperature or high-humidity environments?
A: The relay is rated for ambient temperatures from -25°C to +60°C. For installations in high-humidity environments, the IP20 front-panel rating should be supplemented with appropriate enclosure-level protection (minimum IP54 cabinet) to maintain compliance with IEC 60529 ingress protection requirements. Derating may apply at sustained ambient temperatures above 55°C.

Q3: How does the thermal memory function affect restart compliance in safety-regulated facilities?
A: The thermal memory function retains the accumulated thermal state of the bimetal element even after a power interruption. This prevents a thermally stressed motor from being restarted before adequate cooling has occurred — a behavior that directly supports compliance with IEC 60204-1 machine safety requirements and reduces the risk of insulation degradation in high-cycle duty applications.

Q4: Is the 3RU1136-4HB0 compatible with firmware-controlled motor management systems or PROFIBUS/PROFINET architectures?
A: The 3RU1136-4HB0 is a standalone electromechanical thermal relay and does not incorporate digital communication interfaces. For installations requiring fieldbus integration, Siemens SIMOCODE pro motor management systems provide the appropriate platform. The 3RU1136-4HB0 is optimized for direct-on-line and star-delta starter configurations where simplicity, reliability, and compliance auditability are the primary design criteria.

Q5: What documentation is required to validate this component for use in a pharmaceutical GMP environment?
A: For GMP qualification, the following documentation is typically required: manufacturer’s declaration of conformity (CE), IEC 60947-4-1 test certification, material safety data (RoHS compliance), and country of origin certification. All of these are available upon request for the 3RU1136-4HB0, supporting IQ/OQ documentation packages for equipment qualification under FDA 21 CFR and EU GMP Annex 11 frameworks.

Q6: How should the current setting be determined for motors with a service factor greater than 1.0?
A: For motors with a service factor (SF) of 1.15 or higher, the current setting dial should be aligned to the motor’s actual measured operating current under full-load conditions, not the nameplate FLA multiplied by the service factor. This approach ensures that the relay’s trip curve provides protection calibrated to real thermal stress rather than theoretical maximum values, which is the recommended practice under NEMA MG-1 and IEC 60034 motor standards.

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