Inrush Current Protection Series

ESB AC Inrush Current Limiters 3.6kW–46kW

German-engineered peak current limiters for 1-phase, 2-phase, and 3-phase AC networks. Designed to prevent circuit breaker tripping and safeguard industrial control cabinets.

3.6kW – 46kWSystem Capacity
1PH / 2PH / 3PHMulti-Phase Support
Up to 4,000mAltitude Certified
B-Type MCBCompatible Sizing
Engineering Excellence

Prevent Nuisance Tripping & Protect Industrial Infrastructure

High-capacity switch-mode power supplies, electronic ballasts, transformers, and LED power drivers exhibit extreme inrush currents when energized. This millisecond current spike can reach up to 50 times the nominal rating, causing upstream Miniature Circuit Breakers (MCBs) to trip instantly and damaging mechanical switches or contactors.

The CAMTEC ESB series solves this critical industrial power challenge through active peak current limiting. By ramping current smoothly during start-up, the ESB allows engineers to size circuit breakers according to actual continuous load requirements rather than startup spikes, significantly reducing cable cross-section costs and panel footprint.

  • Integrated high-power bypass relays for near-zero continuous thermal losses
  • Failsafe active monitoring preventing relay contact welding or thermal overload
  • Suitable for inductive and heavy capacitive loads in harsh industrial grids
  • Compact TS35 DIN-rail enclosure (1TE to 5TE modular widths or IP40 housings)
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CAMTEC ESB Inrush Current Limiter deployed in high power industrial infrastructure
Product Lineup

CAMTEC ESB Series Model Overview

Explore our precision-manufactured inrush current limiters designed for high-availability factory automation, infrastructure, and heavy industrial machinery.

CAMTEC ESB001 DIN Rail Inrush Current Limiter
1TE Width · 1PH 230Vac

ESB001 Series

3,680W Capacity | Ultra-Compact

Ultra-narrow 1TE DIN-rail module engineered for 230Vac single-phase circuits. Designed for high altitude operation up to 4,000m above sea level.

  • Peak Limiting: 24A to 43A
  • RMS Current: 17A to 30.1A
  • Min. MCB Sizing: 6A B-Type
  • Continuous Current: 16A
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CAMTEC ESB101 DIN Rail Inrush Current Limiter
2TE Width · 115Vac / 230Vac

ESB101 Series

3,680W Capacity | Universal Input

Versatile 2TE DIN-rail solution with multi-voltage support (115Vac & 230Vac). Built to withstand high-altitude grid requirements and extreme capacitive switch-on events.

  • Peak Limiting: 5A to 48A
  • RMS Current: 3.5A to 33.9A
  • Min. MCB Sizing: 2A A-Type to 13A B-Type
  • Wide Temp Window: -40°C to +70°C
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CAMTEC ESB303 3-Phase Inrush Current Limiter
5TE Width · 3x1PH / 2-3PH

ESB303 Series

3.6kW to 19.2kW | Multi-Phase

Robust 5TE DIN-rail peak limiter for 3x230Vac single-phase lines or 400Vac 2-3 phase systems with neutral wire. Altitude rated to 4,000m.

  • Peak Limiting: 3x 48A
  • RMS Current: 3x 33.9A
  • MCB Protection: 13A to 16A B-Type
  • Continuous Current: 3x 16A
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CAMTEC ESB00351 High Power Inrush Limiter
Heavy-Duty · 1PH 230Vac

ESB00351 Series

6,900W Capacity | High Current

High-current single-phase limiter handling continuous AC currents up to 30A. Designed specifically for heavy capacitive industrial power systems.

  • Peak Limiting: 35A
  • RMS Current: 24.8A
  • MCB Protection: 13A to 30A B-Type
  • AC Voltage: 184–264Vac
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CAMTEC ESB00163 3-Phase Inrush Current Limiter
3-Phase · Independent Phase Control

ESB00163 Series

23,000W Capacity | 400Vac + PE

Industrial 3-phase limiter capping peak currents on each phase independently. Ideal for drive cabinets, processing lines, and machine building.

  • Peak Limiting: 3x 22.6A
  • RMS Current: 3x 16A
  • MCB Protection: 6A to 16A B-Type
  • Input: 2-3x 170–575Vac
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CAMTEC ESB00323 High Power 3-Phase Limiter
Heavy Industrial · 3-Phase 46kW

ESB00323 Series

46,000W Capacity | Maximum Power

Our highest-rated 3-phase inrush current limiter, delivering up to 32A continuous current per phase across heavy-duty automation backbones.

  • Peak Limiting: 3x 69.6A
  • RMS Current: 3x 48A
  • MCB Protection: 16A to 32A B-Type
  • Continuous Current: 3x 32A
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Technical Matrix

Technical Specifications Comparison

Compare model ratings to select the optimal inrush current limiter for your electrical installation.

Detailed electrical ratings for CAMTEC ESB AC inrush current limiters. Built to DIN EN 60950-1 & DIN EN 62368-1 standards.
Model Series Mains Input Voltage Connected Power Limiting Peak Current Limiting RMS Current Recommended MCB Action
ESB001.24 / LED 184–264Vac 1PH (16⅓–440Hz) 3,680 W 24A / 43A 17A / 30.1A 6A to 13A B-Type Get a Quote
ESB101.Series 90–130Vac / 184–264Vac 1PH 3,680 W 5A to 48A 3.5A to 33.9A 2A A-Type to 13A B-Type Get a Quote
ESB303.LED 1-3x 200–240Vac+N / 2-3PH 400Vac+N 3,680 W – 19,200 W 3x 48A 3x 33.9A 13A to 16A B-Type Get a Quote
ESB00351.T 184–264Vac 1PH+N+PE 6,900 W 35A 24.8A 13A to 30A B-Type Get a Quote
ESB00163 A/B 2-3x 170–575Vac 3PH+PE 23,000 W 3x 22.6A 3x 16A 6A to 16A B-Type Get a Quote
ESB00323 A/B 2-3x 170–575Vac 3PH+PE 46,000 W 3x 69.6A / 3x 68.6A 3x 48A 16A to 32A B-Type Get a Quote
ESB201.LED (IP40) 184–264Vac 1PH (16⅓–440Hz) 3,680 W 48A 33.9A 13A to 16A B-Type Get a Quote
Key Applications

Where Are CAMTEC ESB Limiters Deployed?

System designers and control panel builders specify CAMTEC inrush protection to ensure uninterrupted operation across sensitive global infrastructure.

■ Stadium Lighting & High-Power LED Arrays ■ Automation Machinery & Robotics ■ Railway Infrastructure & Signal Control ■ Medical Imaging & Diagnostic Racks ■ Data Centers & UPS Input Substations ■ Tunnel Ventilation & Public Lighting

Why OEM Engineers Trust CAMTEC

  • High Altitude Testing: Certified for operations up to 4,000m (13,123 ft) above sea level.
  • Extreme Frequency Range: Supports 16⅓ Hz to 440 Hz utility and military grid frequencies.
  • Thermal Self-Protection: Integrated internal bypass safeguards unit during severe brownouts.
  • DIN-Rail Mountable: Standardized TS35/7.5 & TS35/15 mounting for fast installation.
Technical FAQ

Frequently Asked Questions

NTC thermistors require time to cool down before they can limit inrush current again. If power fluctuates or is cycled rapidly, a warm NTC offers zero protection. CAMTEC ESB limiters utilize active electronic timing and bypass relays, providing instantaneous re-triggering protection even during rapid power cycling.
Yes. Standard ESB models (including ESB001, ESB101, ESB303, and ESB201) are rated and certified for operation up to 4,000 meters (13,123 feet) above sea level without voltage derating.
Models like the ESB00163 and ESB00323 limit peak current on each phase independently. If one phase experiences an asymmetrical surge, only that phase is regulated, keeping the remaining phases stable and preventing unbalance on the 3-phase line.
Yes. Because CAMTEC designs and manufactures all products at our own facility in Pfinztal, Germany, we can customize operating parameters, terminal connectors, and enclosure coatings for OEM system integrators.

Need Technical Advice for Your Project?

Contact our senior engineering team to calculate load capacity and specify the exact ESB model for your installation.

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