Eureka LSTO20D/003-A 3 Pole 20 Amp RCBO 10kA 30mA D-Curve Earth Leakage Safety Switch

Description

Three-phase D-Curve protection in one module.

The Eureka LSTO20D/003-A combines overload, short-circuit and earth-leakage protection in a single 3 pole unit. Its D-Curve rating handles high inrush loads, while saving space on the switchboard.

Key Features

• 3 Pole RCBO (combined RCD and MCB)
• 20 Amp rated current
• 10kA breaking capacity
• 30mA residual current sensitivity
• D-Curve tripping characteristic
• Type A earth leakage detection (AC and pulsating DC)
• Neutral fly lead supplied
• Chassis mount or DIN rail mount
• Tested and certified in Australia to AS/NZS IEC 61009-1

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Why it Matters

D-Curve for high inrush loads

The D-Curve trips at a higher multiple of rated current than a C-Curve. That tolerance suits circuits with heavy startup surges, holding firm on the inrush while still tripping fast on a genuine fault.

Type A detection for modern loads

Type A sensing detects both AC and pulsating DC earth leakage. Electronic loads and rectifier-fed equipment produce leakage that older Type AC devices can miss. Type A keeps personnel protection effective on these circuits.

Combined protection, less board space

By integrating RCD and MCB functions into one 3 pole device, the LSTO20D/003-A frees module positions on a busy three-phase board and cuts wiring complexity. Supplied with a neutral fly lead, it installs cleanly via chassis or DIN rail mount.

Q: Is the LSTO20D/003-A a Type A safety switch?
A: Yes. It is a Type A RCBO, which detects both standard AC earth leakage and pulsating DC leakage from electronic and rectifier-fed equipment.

Q: What is the residual current sensitivity of the LSTO20D/003-A?
A: It has a 30mA sensitivity, the standard level for personnel protection against electric shock under Australian wiring rules.

Q: How is the LSTO20D/003-A mounted?
A: It can be chassis mounted or mounted on a DIN rail, giving flexibility for different switchboard setups. It is supplied with a neutral fly lead.