Interactive Catalog Replaces Catalog Pages
Sensing and Control
Honeywell Inc.
11 West Spring Street
Freeport, Illinois 61032
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Basic Switches MT Series
Magnetic Blow-out
70HoneywellSensingandControlForapplicationhelp:call1-800-537-6945.
FEATURES
1
Arc resistant case
1
Mechanical life of 100,000 operations
— 95% survival
1
Temperature tolerance to +180°F
(82
°C)
1
Mounting interchangeability with Z
switches
1
UL recognized
GENERAL INFORMATION
MT (single-pole double-throw) magnetic
blow-out switches are designed to switch
high capacity (125 and 250 VDC) sys-
tems.Anintegralmagnet aroundthe con-
tact gap protects the contacts by deflect-
ing the arc. Vents between the cover and
housing allow the hot gas to escape.
These switches are designedfor the con-
trol of DC motors, solenoids, etc.
AVAILABLE TERMINALS
Solder (No listing designation) A28
6-32NC H .218
N Screws
will accept up to #12 wire.
ELECTRICAL RATING
Electrical Data and
Circuitry UL Codes
Single-pole
double-throw
unless
otherwise noted
in order guide
K Rating established with
switch non-polarized
10 amps, 125 vac or vdc;
1/4 hp, 125 vac or vdc.
UL Code L 168
Non-polarized:
10 amps res. or 1/4 hp, 125 vdc;
3 amps max. res. 250 vdc.
Polarized*:
10 amps res. or 1/2 hp, 125 vdc;
3 amps max. res., 250 vdc.
*To polarize, connect negative side of line to common terminal. To
achieve the same effect, mount switch with brass screws, using a
non-magnetic barrier (at least
1
⁄4N thick) between the switch and
mounting surface.
Characteristics: O.F. – Operating Force;
R.F. – Release Force; P.T. – Pretravel;
O.T. – Overtravel; D.T. – Differential Travel;
O.P. – Operating Position.
ORDER GUIDE
Electrical O.F. R.F. min. P.T. max. O.T. min. D.T. max. O.P.
Data and newtons newtons mm mm mm mm
Catalog Listing Recommended For UL Codes ounces ounces inches inches inches inches
MT-4R-A28 Pin plunger
SPDT
10 Amps
K
3,34-5,0
12-18
1,39
5
1,02
.04
0,13
.005
0,1-0,18
.004-.007
15,9±0,38
.625±.015
Dim. Dwg. Fig. 1