The JS ST70AB Basic float switch is a rugged, economical water level control solution for tank filling, emptying and general pump control. Designed around twin displacement weights (liquid-filled balls), the ST70AB provides a reliable differential level action with adjustable weights to set switching differentials typically from 50 mm up to 1,000 mm, making it suitable for sumps, water tanks and simple level control systems.

• Brand: JSPump / JS Pumps
• Model: ST70AB (Basic float switch)
• SKU: 030-500
• Operation: Two displacement weights / liquid-filled balls for dependable on-off control.
• Mounting: Bottom, side or wall/tank mounting for vertical installation. Supplied with a mounting bracket on many retailer packages.
• Electrical ratings: Designed to switch common single-phase pump loads — typical ratings quoted include 110 V (approx. 10–15 A) and 230–240 V (approx. 7.5 A); use a contactor or starter when switching inductive or higher-power motors.
• Connections & range: Commonly available with BSP fittings and a control range that can reach up to several meters depending on configuration. Check datasheet for exact connection sizes and maximum temperature limits.

Engineered for reliable pump control, the ST70AB is ideal as a tank level sensor, sump level switch, or automatic pump control device. Its simple mechanical design makes it low-maintenance and suitable for potable and non-potable water applications where a basic, cost-effective level switch is required. For heavy inductive loads or three-phase pumps, pair the float switch with a contactor or control panel to protect switch contacts and ensure safe operation.