Snap Action Thermostat

KSD301 Snap Action Thermostat

Series Part Number

Part Number: KSD301 A 110 B C F 2 C
Explanation:

Model Series

KSD301 - Snap-action bimetal thermostat

Contact Type

A - Normally closed; opens when temperature rises to the set point
B - Normally open; closes when temperature rises to the set point
M - Manual reset

Operating Temperature

50-175 - Operating temperature in °C; UL/CUL versions up to 205°C

Temperature Tolerance

A - Action ±3°C; reset ±4°C; for operating temperatures below 105°C
B - Action ±5°C; reset ±8°C; for operating temperatures above 106°C

Bracket Type

C, B, E, H, R, X, D, DL, V, P - Fixed bracket types
O, U, M, S, G - Loose bracket types

Terminal Orientation

F - 0°
R - 90°
T - 45°
L - Opposite 90°

Terminal Size

1 - AMP #187 tab, 4.75x0.8mm
2 - AMP #250 tab, 6.35x0.8mm
3 - Solder tab, 4.75x0.5mm
4 - DIP tab, 2.54mm pitch
6 - Weld tab
7 - AMP #187 tab

Base Material

Blank - Bakelite
C - Ceramic

Description

The KSD301 snap action thermostat is a compact bimetal mechanical thermostat for temperature control and thermal protection. It uses a snap disc mechanism to open or close the contact quickly when the set temperature is reached, helping reduce arcing, improve reliability and extend service life.

Key Features

  • Miniature hermetically sealed bimetal snap disc construction.
  • Single-pole, single-throw contact structure for resistive load applications.
  • Automatic reset, manual reset and normally open or normally closed contact options.
  • Suitable for home appliances, HVAC equipment, heat and smoke detectors, industrial devices and laboratory instruments.

Electrical Ratings

Resistive load16A 125V AC, 10A 250V AC, 16A 250V AC
Contact actionContact opens or closes when temperature rises to the set point, depending on selected contact type.
Reset typeAutomatic reset or manual reset options.

Order Code

The order-code diagram explains how to specify contact type, temperature tolerance, bracket style, terminal orientation and terminal size.

Snap action thermostat order code
KSD301 ordering code for contact, temperature, bracket, terminal and base options.

Contact Type

AContact opens when temperature rises to the set point, normally closed.
BContact closes when temperature rises to the set point, normally open.
MManual reset.
Snap action thermostat normally closed contact
Normally closed thermostat contact arrangement.
Snap action thermostat normally open contact
Normally open thermostat contact arrangement.

Bracket Options

Bracket styles support different mounting requirements. Stainless steel cap versions are available for D, DL, V and U types.

C Type
C type thermostat bracket
C-type bracket dimensions.
B Type
B type thermostat bracket
B-type bracket dimensions.
E Type
E type thermostat bracket
E-type bracket dimensions.
H Type
H type thermostat bracket
H-type bracket dimensions.
R Type
R type thermostat bracket
R-type bracket dimensions.
X Type
X type thermostat bracket
X-type bracket dimensions.
D Type
D type thermostat bracket
D-type bracket dimensions.
DL Type
DL type thermostat bracket
DL-type bracket dimensions.
V Type
V type thermostat bracket
V-type bracket dimensions.
P Type
P type thermostat bracket
P-type bracket dimensions.
O Type
O type thermostat bracket
O-type bracket dimensions.
U Type
U type thermostat bracket
U-type bracket dimensions.
M Type
M type thermostat bracket
M-type bracket dimensions.
S Type
S type thermostat bracket
S-type bracket dimensions.
G Type
G type thermostat bracket
G-type bracket dimensions.

Terminal Orientation

Choose the terminal orientation that fits the wiring space and mounting direction.

F / 0 degree
Thermostat terminal orientation 0 degree
F terminal orientation at 0°.
R / 90 degree
Thermostat terminal orientation 90 degree
R terminal orientation at 90°.
T / 45 degree
Thermostat terminal orientation 45 degree
T terminal orientation at 45°.
L / 90 degree opposite
Thermostat terminal orientation L type
L terminal orientation at the opposite 90° position.

Terminal Size

Terminal options allow the thermostat to match common quick-connect wiring requirements.

Type 1
Thermostat terminal size type 1
Type 1 terminal dimensions.
Type 2
Thermostat terminal size type 2
Type 2 terminal dimensions.
Type 3
Thermostat terminal size type 3
Type 3 terminal dimensions.
Type 4
Thermostat terminal size type 4
Type 4 terminal dimensions.
Type 6
Thermostat terminal size type 6
Type 6 terminal dimensions.
Type 7
Thermostat terminal size type 7
Type 7 terminal dimensions.

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