ETA8345 Circuit Breaker (Industrial-Grade 30A Thermal-Magnetic Protection)

Engineered for mission-critical safety instrumented systems, the ETA8345 circuit breaker provides robust 30-ampere overcurrent protection for HIMA H7201 infeed fuse boards. This SIL 3-certified component combines rapid fault response with maintenance-free reliability, making it the preferred choice for process industries where equipment protection and operational continuity are non-negotiable.

Designed specifically for integration with HIMA HIMax and HIMatrix safety controllers, this breaker addresses the unique challenges of redundant power architectures in hazardous environments. Whether you're safeguarding oil refinery control systems or pharmaceutical clean room automation, the ETA8345 delivers consistent performance across temperature extremes and demanding electrical conditions.

With tool-free DIN rail mounting and hot-swap capability, maintenance teams can replace units in under 60 seconds without system shutdown—minimizing unplanned downtime while maintaining full compliance with IEC 61508 functional safety standards.

Core Features & Benefits

✓ SIL 3 Functional Safety Certification
Meets IEC 61508 requirements for safety-critical applications, ensuring your system maintains integrity during fault conditions. Ideal for applications requiring proof-tested protection devices with documented failure rates.

✓ Dual-Mode Thermal-Magnetic Trip Mechanism
Combines inverse-time thermal response for overload conditions with instantaneous magnetic tripping for short circuits. Protects sensitive downstream electronics while preventing nuisance trips during motor inrush or capacitive charging.

✓ 10kA Breaking Capacity at 250V AC
Handles high-energy fault currents without contact welding or arc damage. Exceeds typical industrial requirements for coordination with upstream protective devices in TN and IT earthing systems.

→ Extended Temperature Range (-25°C to +70°C)
Maintains calibrated trip characteristics in outdoor enclosures, unheated buildings, and high-ambient process areas. No derating required within specified range.

→ Visual Trip Indication & Manual Reset
Color-coded position indicator allows technicians to identify tripped breakers at a glance during troubleshooting. Manual reset prevents automatic re-energization of faulted circuits.

→ CE/UL/IEC 60947-2 Multi-Standard Compliance
Single part number satisfies North American, European, and international regulatory requirements—simplifying global project specifications and spare parts inventory.

Application Scenarios

Petrochemical Emergency Shutdown Systems
In offshore platforms and refinery SIS architectures, the ETA8345 protects H7201 power supplies feeding critical shutdown valves and flame detection circuits. Rapid fault isolation prevents loss of safety function during process upsets, while SIL 3 certification supports systematic capability calculations per IEC 61511.

Pharmaceutical Batch Control Redundancy
Clean room automation systems use dual H7201 boards for N+1 power redundancy. The ETA8345's selective coordination characteristics ensure that only the faulted branch trips, maintaining control system availability during single-point failures in recipe-critical production sequences.

Water Treatment SCADA Infrastructure
Municipal treatment plants deploy these breakers to protect remote telemetry units and chemical dosing controllers. The extended temperature rating accommodates unheated pump stations, while the 20+ year service life matches infrastructure replacement cycles.

Power Generation Auxiliary Systems
Combined-cycle plants integrate ETA8345 units in turbine control cabinets and generator excitation systems. The breaker's high breaking capacity handles fault currents from station service transformers without requiring series current limitation.

Mining Conveyor Safety Interlocks
Underground material handling systems use HIMA controllers for emergency stop and pull-cord monitoring. The ETA8345 protects these circuits from cable damage and moisture ingress faults common in harsh mining environments.

Technical Parameters & Selection Guide

Selection Criteria: Calculate total connected load including inrush currents from contactors and motor starters. For H7201 boards powering multiple I/O modules, sum the maximum current draw from all connected cards plus 20% margin. Verify that upstream supply fuses or MCCBs provide backup protection with proper discrimination time intervals.

Extended Functions

Auxiliary Contact Integration: While the standard ETA8345 provides mechanical indication only, it can be paired with HIMA diagnostic modules (H4135 series) to transmit breaker status to the safety controller. This enables predictive maintenance alerts when trip frequency exceeds baseline thresholds.

Seismic Qualification: For installations in earthquake-prone regions, the ETA8345 has been tested to IEEE 693 seismic standards when mounted in approved enclosures. Contact our engineering team for certification documentation required for nuclear or critical infrastructure projects.

Customization Options: High-volume OEM customers can request factory-applied color coding, custom trip curves, or pre-wired terminal blocks to reduce panel assembly time. Minimum order quantities and lead times apply.

Delivery & Service Assurance

Standard Lead Time: 3-5 business days for stock items; 4-6 weeks for factory-direct orders requiring custom configurations or large quantities (100+ units).

Warranty Coverage: 12-month manufacturer warranty against defects in materials and workmanship. Extended warranties available for critical spares programs.

Technical Support: Our application engineers provide pre-sale sizing assistance, coordination studies, and post-installation troubleshooting via phone, email, and remote diagnostics. Emergency replacement units ship same-day when ordered before 2 PM CST.

Documentation Package: Each unit includes installation instructions, dimensional drawings, trip curve graphs, and material certificates. IEC 61508 functional safety manuals available for download from our technical library.

Frequently Asked Questions

What is the difference between Type C and Type D trip curves for circuit breaker selection?
Type C breakers (like the ETA8345) trip magnetically at 5-10 times rated current, making them suitable for general industrial loads with moderate inrush. Type D units trip at 10-20× In and are reserved for high-inrush applications like large transformers or welding equipment. For H7201 power distribution, Type C provides optimal coordination.

Can the ETA8345 circuit breaker be used in Zone 1 hazardous area classifications?
The breaker itself is suitable for Zone 2/Division 2 when installed in appropriate enclosures. For Zone 1/Division 1 applications, it must be housed in explosion-proof or purged/pressurized enclosures certified to ATEX/IECEx or NEC 500 standards. Consult our hazardous location specialists for enclosure recommendations.

How do I verify proper coordination between the ETA8345 and upstream protective devices?
Request time-current curve data from our technical team and overlay it with your upstream device curves using coordination study software. The ETA8345's magnetic trip point should be at least 2× lower than the upstream device's instantaneous setting to ensure selective tripping.

What maintenance intervals are recommended for industrial circuit breaker applications?
Inspect breakers annually for loose terminals, dust accumulation, and mechanical wear. Exercise (trip and reset) quarterly to prevent contact oxidation. Replace units that have interrupted fault currents exceeding 80% of rated breaking capacity, even if they appear functional.

Does the breaker support remote monitoring or IoT integration capabilities?
The standard ETA8345 provides mechanical indication only. For digital status feedback, integrate with HIMA H4135 safety relay modules or third-party monitoring systems using auxiliary contact blocks. We can recommend compatible interface solutions based on your control architecture.

Are replacement parts available for the ETA8345 circuit breaker?
These breakers are sealed units not intended for field repair. We maintain strategic inventory of replacement units for rapid deployment. For critical applications, consider establishing a consignment stock agreement to guarantee 4-hour replacement availability.

Take the Next Step

Protect your HIMA safety systems with proven overcurrent protection. Contact our technical sales team at sale@ninermas.com or +0086 187 5021 5667 to discuss your specific application requirements, request coordination studies, or place your order today.

© 2026 NINERMAS COMPANY LIMITED. All rights reserved.
Original Source: https://ninermas.com
Contact: sale@ninermas.com | +0086 187 5021 5667