Basic Switches

BZ/BA Series

Standard

For application help: call 1-800-537-6945.

Honeywell Sensing and Control

47

STANDARD BASIC SWITCH CUT-A-WAY

The cut-a-way shown is representative of the standard basic switches described in this

catalog.

GENERAL INFORMATION

MICRO SWITCH standard basic switches

are precision snap-action mechanisms

enclosed in accurately molded plastic

cases. These switches are carefully man-

ufactured and thoroughly inspected.

They are industry known for their com-

pactness, light weight, accurate repeata-

bility and long life.

The type BZ switch design meets most

applications needs. Modifications of the

standard silver contact design and mate-

rial, spring configuration, and plunger lo-

cations give the type BM, BA and BE

switches greater electrical load handling

capacity. Other changes in materials and

switch design provide operating charac-

teristics, temperature tolerances, and

sealing to cover a wide range of special

requirements.

FEATURES

Operating force as low as 4 oz. (113

grams) maximum

Sensitive differential travel as low as

.0002 to .0003 inches (0,005 to 0,008

mm)

Power load switching capability to 25

amperes

Motor handling capacity to 2 horse-

power at 250 VAC

Long mechanical life

High temperature constructions for up

to

+400°F (204°C)

Momentary or maintained contact

action

Alloy contacts available for special ap-

plication needs

Variety of integral actuators

Variety of auxiliary actuators

Variety of terminal designs

Optional sealed plunger and cover

Stainless steel snap spring available

Military standard construction availa-

ble with over 50 listings on the MIL-

S-8805 Qualified products list

UL recognized, CSA certified

Characteristics as stated are taken at nor-

mal room temperature and humidity.

These may vary as temperature and hu-

midity conditions differ.

MOUNTING DIMENSIONS

Mounting dimensions are included at the

end of each product section. They are

shown in English and metric equivalents.

These dimensions are for reference only.

For exacting layout work, request an engi-

neering layout work, request an engineer-

ing drawing from the 800 number.

Mounting holes for Types BZ, BM, BA, BE,

DT, MT, and 6AS switches accept pins or

screws of .139 inch (3,53 mm) diameter.

RECOMMENDED TORQUE (max.)

Mounting screws ............3 in./lbs.*

Terminal screws ..............4 in./lbs.

Panel mount bushing .......4-6 in./lbs.

* Note: Tightening

mounting

screws

above 3 in./lbs. changes operat-

ing characteristics and increases

the possibility of cracking the

case.

GENERAL SWITCH IDENTIFICATION

First letter in catalog listing designates:

B = Single-pole double-throw

W = Single-pole single-throw (normally closed)

Y = Single-pole single-throw (normally open)

Second letter in catalog listing designates:

Z = Standard 15-amp version

M = 22-amp version

A = Standard 20-amp version

E = 25-amp version

This section covers only over 100 of our most popular BZ/BA type Series

catalog listings. If you don’t find what you’re looking for, it’s likely one of

the approximately 1800 other active listings will meet your needs. Con-

tact the 800 number.

UL/CSA

Our basic switches are Component Recognized by Underwriters’ Laboratories, Inc. and certified by Canadian Standards Associ-

ation. The BA, BZ, and BM line is covered as Special Use Switches to UL Standard 1054; the BE line is covered as an Industrial Motor

Controller to UL Standard 508.

Agency File References

are:

BA

UL File E12252, issued 12-09-88

BM

UL File E12252, issued 12-08-88

BZ

UL File E12252, issued 6-29-89

BE-1,2,5

UL File E22779, Vol. 4, Sec. 1

BE-R

UL File E22779, Vol. 4, Sec. 2