ETA REX12-TA2-107 Modular Circuit Breaker

ETA REX12-TA2-107 Modular Current Protection サーキットブレーカー

1. モデルコードの内訳

Model split: REX12 TA2 107

1. REX12: ETA REX12 series modular current protection circuit breaker (electronic overload protector / miniature electronic circuit protector, DIN rail mounted)
2. TA2: Sub-series functional code, 2-channel universal type for DC and AC, equipped with temperature monitoring and fault signal output
3. 107: Rated current specification code → Rated current 7A
4. Brand Overview

ETA (Swiss ETA): A global brand of industrial electronic protection components, specializing in miniature equipment circuit breakers, electronic overcurrent protectors and thermal-magnetic circuit breakers. Widely applied in industrial control cabinets, robotics, 鉄道輸送, photovoltaic energy storage and medical devices.

REX12 Series: Ultra-thin modular electronic protection devices as a replacement for traditional fuses, featuring remote signal feedback and precise segmented current limiting.

Ⅲ. コア仕様 (REX12-TA2-107)

電気仕様

Rated Current In: 7あ

チャンネル: Dual independent protection channels (separate current limiting and fault alarm for two outputs)

動作電圧: Universal for DC 24V / AC 24~230V

旅行の種類: Electronic inverse-time overload protection + instantaneous short-circuit cut-off

信号出力: TA2 standardly equipped with two sets of passive fault contacts (いいえ/いいえ, connectable to PLC for fault signal collection)

取り付け: 標準35mm DINレール, module width only 12mm per channel

機能的な特徴

1. Independent circuit protection for dual channels without mutual interference
2. Precise electronic current limiting, eliminating aging issues of traditional fuses
3. Manual reset after overload/short-circuit tripping; no consumable replacement required
4. Remote fault alarm contacts for automated equipment monitoring
5. 低消費電力, ultra-thin design dedicated to dense cabinet wiring
6. 典型的なアプリケーションシナリオ

24V DC output circuit protection for industrial PLCs and servo drives

Branch power supply protection for robot IO modules and sensors

Multi-channel DC power supply protection for medical equipment and test instruments

On-board control cabinets for rail transit and auxiliary circuits of energy storage BMS

1. Reference Alternative Models within the Same Series

REX12-TA2-103: 3A dual-channel

REX12-TA2-105: 5A dual-channel

REX12-TA2-110: 10A dual-channel

REX12-TA1-XXX: Basic single-channel model (without separate dual-channel alarm)

1. Key Distinction Points

TA1 = single channel; TA2 = dual channel with independent fault signals; the last two digits of the three-digit suffix represent rated current (107 = 7A).

Full Technical Analysis of ETA REX12-TA2-107 Electronic Overcurrent Protector

> 注記: The previous interpretation of the model suffix “107” was inaccurate.

1. Digit-by-Digit Model Code Decoding

Standard full ordering format: `REX12 TA2 107 DC24V XA/XA`

The provided `REX12-TA2-107` is the abbreviated base model of the series; full purchasing models require supplementary suffix current specifications.

1. Full List of Core Specifications

電気仕様

機械式 & Mounting Specifications

Ⅲ. 保護メカニズム & 動作原理

1. Precision Electronic Sampling: Built-in current sensors collect real-time circuit current; a dedicated chip executes inverse-time tripping algorithms. Higher overload multiples lead to faster tripping, precisely matching cable thermal withstand capacity with far lower dispersion than traditional fuses.
2. Microsecond-Level Short-Circuit Cutoff: Upon detection of short-circuit current, semiconductor switches shut down within microseconds to limit fault current rise, preventing surge damage to downstream loads and avoiding tripping of the upstream switching power supply.
3. Fail-Safe Backup Protection: Built-in blade fuses compliant with IEC 60127-4 and UL248-14 standards. When electronic protection components malfunction, the fuse acts as the final safety barrier, EN準拠 60204-1 for machine equipment cable protection.
4. Selective Disconnection: Only the faulty branch is cut off while other branches remain powered, greatly improving system availability and avoiding full power supply shutdown caused by single-point faults.
5. Installation Wiring & システム構成

Power Distribution Connection

Power input is uniformly connected via EM12-T power distribution modules. Side bridging arms enable parallel power supply between modules without additional jumper wires. A single set of distribution modules supports up to 16 parallel protection modules; matched PM12-T potential expansion modules enable separate GND circuit routing.

負荷 & Signal Wiring

Load Side: One set of Push-in terminals per channel for direct connection to load positive circuits; wire stripping length: 8～10mm.

Signal Side: Independent fault signal output terminals per channel, connectable to PLC DI modules for remote fault monitoring and alarm.

設置上の注意事項

Mount modules vertically on DIN rails with at least 10mm clearance above for heat dissipation.

AC voltage input is strictly prohibited; the device is only applicable to 24V DC systems.

1. 安全認証 & 準拠基準

UL 508 Certification for Industrial Control Equipment

UL 2367 Solid-State Circuit Breaker Certification

cULus Dual Certification for Canada & 米国

で 60204-1 Electrical Equipment Standard for Machinery (cable protection compliance)

IEC 60127-4 Miniature Fuse Standard (backup fuses)

RoHS Environmental Compliance

1. Model Selection Comparison within the Same Series

Ⅶ. 典型的なアプリケーションシナリオ

Branch protection for 24V DC power distribution systems in industrial control cabinets

Power supply protection for field components including PLC IO modules, センサー, solenoid valves and indicator lamps

自動化された生産ライン, robot control cabinets and semiconductor manufacturing equipment

Auxiliary circuits of new energy storage BMS and on-board control cabinets for rail transit

Multi-channel low-voltage power supply protection for medical testing equipment and laboratory instruments

VIII. 一般的な障害のトラブルシューティング マトリックス

1. 端子のピン配置 & Wiring Definition

The REX12-TA2-107 adopts a system-level bridging architecture. Power input is connected in parallel via side-mounted matching EM12-T power distribution modules, while load and signal terminals are wired directly on the front face. Terminals are divided into three major functional zones:

1. Terminal Zones & Pin Definitions

From top to bottom on the module front (operation side), terminals are divided into power bridging zone, load output zone and signal output zone. Detailed pin definitions are as follows:

> Core Note: This model is a positive-side protection type, which only cuts off the load positive circuit while the negative circuit remains continuously connected. Fault signals are low-level active (NPNタイプ), directly compatible with DI input modules of mainstream PLC brands including Siemens and Mitsubishi.

2. 配線仕様 & 予防

All terminals are Push-in spring terminals; wires can be inserted or removed by pressing the orange release button without tools.

The module must be installed side-by-side with EM12-T series power distribution modules to receive operating power; standalone modules cannot be powered on.

A single EM12-T distribution module supports up to 16 parallel REX12 protection modules with total current not exceeding 40A.

No additional current limiting required for capacitive load startup; each channel supports shock-free startup of capacitors up to 20000μF.

誘導負荷 (電磁弁, リレー) require freewheeling diodes connected in parallel on the load side to prevent reverse voltage breakdown of internal MOSFETs.

1. Cross-Brand Compatible Replacement Solutions

The ETA REX12 series adopts a proprietary bridging power distribution architecture, with no cross-brand models offering 1:1 fully compatible pinouts. Two replacement categories sorted by ascending replacement cost are listed below:

解決 1: Same Footprint Functional Replacement (Retain DIN Rail Space, Replace Distribution & Protection Modules)

Suitable for cabinets with limited space where the 12.5mm dual-channel width must be maintained; power distribution modules also require simultaneous replacement.

解決 2: Independent Dual-Channel Functional Replacement (Direct Complete Unit Replacement, No Matching Distribution Modules Required)

Suitable for scenarios where the original REX12 power distribution system is not retained and independent wiring is adopted; higher integration and more flexible wiring.

Key Replacement Reminders

1. Power Distribution Architecture Difference: The side bridging power supply of REX12 is an ETA patented design; all other brands adopt independent terminal wiring, requiring re-routing of power input lines during replacement.
2. Signal Type Matching: REX12 outputs NPN open-collector signals; confirm the signal output type (NPN/PNP/passive contact) of replacement models to match the existing PLC system.
3. トリップ特性: All alternative models feature electronic inverse-time overload protection and instantaneous short-circuit cutoff, with protection curves basically consistent with REX12 for direct replacement.