SUM Ultra-Miniature Snap-Acting Switches

Introduction

C&K Switches’ SUM series is a range of ultra-miniature snap-action switches intended for designs where switching functionality must fit within tight space constraints. The series uses a single-pole, double-throw (SPDT) contact arrangement and supports electrical loads up to 3 A, combining compact form factor considerations with a defined switching capability.

What it does

A snap-action switch changes contact state rapidly when actuated, providing a distinct switching action for position, presence, or user-input detection. The SUM series provides an SPDT configuration, allowing a common contact to switch between two circuits or states.

The switches are specified for a maximum electrical load of 3 A. Electrical life is stated from 10,000 to 300,000 cycles, while mechanical life is specified at a minimum of 1 million cycles. A dielectric strength rating of 500 V RMS is also provided.

These characteristics make the SUM series relevant where a compact basic switch is needed with repeatable mechanical operation and a choice of two switched contact paths.

Applications

Applications that follow directly from the switch type and stated use cases include:

• Position or limit detection in utility-system mechanisms
• Compact switching functions in medical equipment
• User controls, interlocks, or mechanism detection in home appliances
• Space-constrained equipment requiring SPDT snap-action switching
• Mechanical state sensing where long mechanical operating life is important

Design considerations

The SUM series is described as ultra-miniature, so mechanical clearance, actuator alignment, and assembly tolerances should be considered early in a design. Its SPDT contact configuration should also be matched to the intended circuit behavior, particularly where one circuit must be selected while another is disconnected.

Designers should ensure that the switched load remains within the stated 3 A maximum electrical load. Electrical-life performance is specified across a broad range of 10,000 to 300,000 cycles, while the mechanical-life specification is at least 1 million cycles; system requirements should account for both the electrical load and expected actuation count. The stated 500 V RMS dielectric strength may also be relevant when evaluating circuit isolation requirements.

Availability and further information

The source and distributor links on this page provide further information on the C&K Switches SUM ultra-miniature snap-action switch series. Consult the available product documentation and datasheet resources for variant-specific electrical, mechanical, and integration details.