Description

The M54123L is a semiconductor integrated circuit with amplifier designed specifically for high-speed earth leakage circuit breakers. It is equipped with a differential amplifier, latch circuit, and voltage regulator. The M54123L is typically connected to the secondary side of a zero current transformer (ZCT) to detect leakage current through both input amplifiers. The detected signals are then amplified and integrated by an external capacitor. The integrated signal is then input into the latch circuit, whose output is suitable for the characteristics of high-speed earth leakage circuit breakers. The latch circuit only becomes high when the input voltage reaches the fixed level, driving a thyristor connected to the latch circuit's output terminal.

Specifications and features

• Good input sensitivity current temperature characteristics
• High input sensitivity: VT=6.1mV (Typ.)
• Low external component count
• High noise and surge-proof
• Low power dissipation: PD=5mW (Typ.)
• Can be used as both 100V and 200V
• Wide temperature range: -20 °C to +80°C

Application Scenarios

The M54123L is commonly used in high-speed earth leakage circuit breakers. It is specifically designed to detect leakage current and provide suitable output for these types of circuit breakers. Its wide temperature range makes it suitable for various environments.

Comparison

- Good input sensitivity current temperature characteristics

- High input sensitivity

- Low external component count

- High noise and surge-proof

- Low power dissipation

- Can be used as both 100V and 200V

- Wide temperature range

- None identified