The MAC 3 Key float switch is a compact, robust level control device designed for reliable pump automation, tank level sensing, and high-level alarms. This listing is for the float body only (no cable included) so installers can choose the cable type and length that fit their application. The Key series is engineered for dual operation (fill or empty), features IP68-rated waterproofing, and is available in standard polypropylene or recycled-plastic options for a more sustainable choice.

Key features and benefits:

• Dual-mode operation for filling and emptying — flexible for a wide range of pumping and tank control tasks.
• High ingress protection (IP68) and durable PP body suitable for clean and wastewater environments.
• Reliable mechanical microswitch that actuates around a ±45° tipping angle for repeatable switching.
• Compatible with multiple microswitch ratings and cable types so it can be spec’d for 16A/20A and 250–400VAC systems.
• Available accessories: counterweight and piggy-back plug (cable and accessories sold separately).

Typical applications include pump start/stop control, rainwater tanks, cisterns, sump and drainage pumps, overflow alarms, and dry-run protection. The free-hanging counterweight and adjustable free length let you set precise trip points; the smallest practical adjustable change is roughly 20 cm depending on installation. The Key float’s robust design and multiple certification/option choices make it a great choice for both residential and industrial level control projects.

Installation notes: because this SKU is the no-cable float, select the appropriate cable (PVC or H07RN-F neoprene) and microswitch rating for your voltage and load. Use the counterweight accessory to fix the operating range and confirm switching polarity by wiring common + either NO or NC according to required pump or alarm logic. For detailed specs, dimensions, and available cable lengths, consult the manufacturer datasheet and distributor pages.