Basic Switches
Standard
STANDARD BASIC SWITCH CUT-A-WAY
The cut-a-way shown is representative of the standard basic switches described in this
catalog.
BZ/BA Series
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.
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.
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.
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.
GENERAL SWITCH IDENTIFICATION
First letter in catalog listing designates:
Standard
Basic Switches
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
BM
BZ
BE-1,2,5
BE-R
UL File E12252, issued 12-09-88
UL File E12252, issued 12-08-88
UL File E12252, issued 6-29-89
UL File E22779, Vol. 4, Sec. 1
UL File E22779, Vol. 4, Sec. 2
For application help: call 1-800-537-6945.
Honeywell Sensing and Control
47
Basic Switches
Standard
AVAILABLE TERMINALS
Most of the BZ/BA catalog listings have
A2 type terminals. Several other terminal
styles are shown and others are available.
Specific information should be requested
from the 800 number or local Authorized
Distributor.
BZ/BA Series
Solder (No suffix)
Use up to #14 wire
A2
Bottom facing 6-32 NC
×
.218
screw with cup washers
A4
(Same as A2 except #8 screws)
T
Bottom facing 6-32 NC
×
.218 screw
with Sems lockwashers
D5
.250 (6,35 mm) wide
×
.030 (7,62) thick
quick-connect
D6
.250 (6,35 mm) wide
×
.032 (0,81 mm) thick
quick-connect
P4
Side facing 8-32
×
.218 screw with cup washers
PC2
Self lifting pressure plate terminals and plastic
barriers for added dielectric protection
ACTUATORS
BA, BE, BM and BZ standard basic
switches use the actuators described.
Pin plunger; in-line motion
Overtravel plunger; in-line
applications requiring additional
overtravel
Added overtravel in a panel mount
roller plunger; Actuation by cams
Leaf; Low-force, slow moving cams or
slides
Roller lever; Very low force, fast
moving cams
Roller leaf; Low-force, large
movement actuation
Lever; Very low force, slow cams and
slides
Added overtravel in a panel-mount
plunger; Heavy-duty in-line
applications or slow cams.
Cam rise should not exceed 30°
48
Honeywell Sensing and Control
For application help: call 1-800-537-6945.
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