ERECTA SWITCH® by Compac Engineering
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Series 15 · ERECTA SWITCH Side Mount

Side Mount Level Switches — No Stem Required

The 15-650 installs through the tank wall and senses liquid level at the mounting point. Horizontal-pivot magnetic reed float switch — fits horizontal tanks, drums, totes, and tight-clearance enclosures where top-entry is not an option.

1/2 NPT · 1/4 NPT · Bulkhead PP · Acetal · Kynar PVDF No Stem · No Nipple RoHS Compliant Made in USA
Weighing side mount against a top-mounted Series 10? Use the selection guide →

How side mount differs from Series 10: Series 10 switches hang vertically on an extended stem — the float travels up and down on the nipple. Series 15 switches mount horizontally through the tank wall — the float pivots on a horizontal axis and senses level at exactly where the switch is installed. No stem, no nipple, no minimum tank depth required.

Products

Series 15 Product Line

Four configurations built on the 15-650 base switch — choose the wiring termination and mounting style that fits your installation.

15-650 Side Mount Level Switch
15-650
Side Mount Liquid Level Switch

The base side mount switch. Lead wire termination. Three mounting options: 1/2 NPT outside-in, 1/4 NPT inside-out, or 0.54″ bulkhead with jam nut.

PP · AC · KRLead Wire3 Mount Options
As low as $17.63
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15-650-R Integrated Relay Level Switch
15-650-R
Side Mount Wire Receptacle Switch Set

15-650 with enclosed wire receptacle housing. 1.66″ dia housing with 1/2″ conduit knockout. 1pk and 10pk available.

PP · AC · KRWire Receptacle1pk + 10pk
As low as $26.97 / 1pk
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15-650-LP LatchPac Latching Relay Switch
15-650-LP
Side Mount Low Profile Receptacle Switch Set

Rain-tight low profile receptacle with 360° nipple rotation for wire exit angle positioning. Installs from outside.

PP · AC · KRLow Profile360° Rotation
As low as $42.17
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15-600-AD 3/4 NPT Adapter
15-600-AD
3/4″ NPT Adapter

Converts the 15-650's 1/2 NPS shank to 3/4 NPT. O-ring sealed. For tanks with 3/4 NPT bosses. Also compatible with Series 10 and Series 20 shanks.

PP · AC · KR1/2 NPS → 3/4 NPTO-Ring Seal
As low as $1.91
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Installation

Three Ways to Install a 15-650

The same base switch handles three mounting configurations — no separate SKU required.

Outside → In on 1/2 NPT

Thread the 15-650 into a 1/2 NPT tank boss from outside the tank wall. The float and sensing section extend into the tank. The most common installation method. No internal access required.

All 15-650 variants
Inside → Out on 1/4 NPT

Pass the switch through the wall from inside the tank, thread the 1/4 NPT section into a 1/4 NPT fitting from inside-out. Useful when outside wall space is constrained or when the fitting is recessed.

15-650 base switch only
Bulkhead through 0.54″ hole

Pass the switch shank through a 0.54″ diameter hole in the tank wall and tighten the jam nut from outside. No tapping required — ideal for plastic tanks, drums, and sheet metal enclosures.

15-650 base switch only
Frequently Asked Questions

Common Questions About This Product

What is the difference between a float level switch and a liquid level sensor?

A float level switch like the Series 15 combination switch is a point-level device: a float rides the liquid and actuates a magnetic reed switch at a set height, giving a simple on/off signal — no power, no firmware, no calibration. "Sensors" usually means continuous measurement (ultrasonic, radar, capacitive). ERECTA SWITCH targets reliable discrete-point control.

What are the typical applications for the Series 15 combination switch?

The Series 15 combination switch is used for pump start/stop control, high-level overflow protection, low-level dry-run protection, and tank or reservoir level alarms in OEM equipment. The modular ERECTA SWITCH system is built into laundry, HVAC, water-treatment, hydraulic, and chemical-handling machinery.

What liquid chemistries is the Series 15 combination switch compatible with?

Choose the material to match the media: Polypropylene (PP) for general aqueous, acids, and bases; Acetal (AC/Delrin) for solvents, fuels, and hydrocarbons; Kynar PVDF (KR) for aggressive or harsh chemicals. Every ERECTA SWITCH model is offered in all three materials.

Is the Series 15 combination switch a point-level or continuous-level device?

The Series 15 combination switch is point-level — it provides a discrete on/off signal at a set height. For multiple switch points, use a multi-level extended-stem set (2-, 3-, or 4-level) instead of a single continuous sensor.

What mounting options are available for the Series 15 combination switch?

ERECTA SWITCH offers vertical top-mount, bulkhead, and extended-stem configurations, plus side-mounted single-point models. The mount style is part of the model number — select the configuration that matches your tank geometry.

How is the actuation level set on the Series 15 combination switch, and how accurate is it?

Point detection is repeatable and mechanical. The trip height on the Series 15 combination switch is set by the 10-715 Precision Nipple, ordered separately in 1-inch increments (1″–70″), so you place the switch point exactly where the application needs it.

Need Help Selecting the Right Configuration?

Tell us your tank geometry, thread size, and fluid chemistry — we'll confirm the right 15-650 variant and wiring termination for your application.

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