Cutler Hammer, Div of Eaton Corp WMZS General Product Line Information

UL 1077 DIN Rail Supplementary Protectors
WMZS Circuit Breakers
Product Overview

UL 1077 DIN Rail Supplementary Protectors

WMZS Circuit Breakers

PRODUCT OVERVIEW

Standard Features

WMZS breaker terminals provide finger and back-of-hand
protection to guard against accidental contact with live parts.

A color-coded red/green indicator provides immediate visual
indication of device status (green for OFF, red for ON) and
isolation function.

Product Overview

Eaton’s WMZS line of miniature circuit breakers includes a broad
range of devices defined as “supplementary protectors.” These
breakers comply with ULT 1077 and CSAT 22.2 No. 235 regula­tions defining supplementary overcurrent protection. In these
applications, branch circuit protection is not required, or is provid­ed by a separate device like a fuse or molded case circuit breaker.

WMZS Supplementary Protectors are typically used for control
circuits, lighting, business equipment, appliances and a range of
other applications where “closer” protection is desired than that
offered by a branch circuit protection device.

All WMZS breakers also incorporate a “trip-free” mechanism.
This prevents the trip function from being defeated by holding
the operator in the ON position.

Worldwide Acceptance

WMZS Supplementary Protectors are UL Recognized for use
in the United States in accordance with NFPAT 70 (NECT). The
devices comply with UL 1077 and CSA 22.2 No. 235, meeting
the requirements for supplementary protectors. These devices
also comply with IEC 60947-2 and are CE marked.

Extensive Product Range

Eaton’s Supplementary Protectors are available in 1-, 2- and 3-pole
configurations and 20 different current ratings from 0.5A to 63A.
Three different trip characteristics, including B, C and D curves,
give you the ability to configure the exact protection scheme you
require. Devices can be used in applications up to 480 Vac and
48 Vdc with short-circuit ratings up to 10 kA.

Ease of Installation

All breakers mount on a standard 35 mm DIN rail. Each device
has box terminals that accept multiple conductors. Bus connec­tors and feeder terminals facilitate mounting and wiring of multiple
miniature circuit breaker arrays in control panel assemblies. Power
to the circuit breakers can also be fed from the line or load side.

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EATON CORPORATION UL 1077 DIN Rail Supplementary Protectors

UL 1077 DIN Rail Supplementary Protectors

Discover These Advanced Features Three Tripping Curves to Choose

Eaton WMZS Supplementary Protectors are available with three
different tripping characteristics, including Type B, C and D.
Definitions for each trip curve are contained on the ordering pages
and can be used to determine the optimal characteristic for your
application. For example, low level short-circuit faults in control wir­ing, such as PLCs, are best protected by devices with Type B trip
characteristics (3 to 5X continuous rating of the device (I

Even though not required by NEC or CEC for Supplementary
Protectors, Eaton’s WMZS devices are current limiting, which
means they interrupt fault currents within one half cycle. Current
limiting devices offer superior protection by reducing peak let­through current and energy.

7200

3600

1200

600

300

120

t [sec]

0.5

0.2

0.1

0.05

0.02

0.01

0.005

0.002

0.001

0.0005

2

1

60

30

10

5

2

1

1

Time-current characteristic acc. to UL 1077

a

conventional
non-tripping current

= 1.13 IN: t > 1 h

I

nt

b

conventional tripping
current

= 1.45 IN: t < 1 h

I

t

3

3

4

5

6

B

Breakers install on
standard DIN rail

Available in 1-, 2- and
3-pole models

Color-coded indicator
provides breaker status
for easy troubleshooting

Captive posidrive terminal
screws with finger and
back-of-hand protection
(IP20)

Trip-free design; breaker
cannot be defeated by
holding the handle in the
ON position

Breaker information
printed on the front of
the device for quick
identification

WMZS Circuit Breakers

PRODUCT OVERVIEW

).

n

c

C

I / I

2.55 IN:
t = 1 – 60 s (I
t = 1 – 120 s (I

d

Type B: 3 IN: t > 0.1 s

e

Type B: 5 IN: t < 0.1 s

f

Type C: 5 IN: t > 0.1 s

g

Type C: 10 IN: t < 0.1 s

h

Type D: 10 IN: t > 0.1 s

i

Type D: 20 IN: t < 0.1 s

7

8

D

1098765432

N

< 32A)

N

< 32A)

N

9

5040302015

Product Overview

Catalog Numbering System

Breaker Family

WMZS = Supplementary Protector

1 = 1-Pole
2 = 2-Pole
3 = 3-Pole

Number of Poles

WMZS 1 B 10

Protective Curve

B = B Curve (3–5X In)
C = C Curve (5–10X In)
D = D Curve (10–20X In)

Ampere Rating

00 = 0.5 Amps
01 = 1 Amps
02 = 2 Amps
03 = 3 Amps
04 = 4 Amps
05 = 5 Amps
06 = 6 Amps

EATON CORPORATION UL 1077 DIN Rail Supplementary Protectors

07 = 7 Amps
08 = 8 Amps
10 = 10 Amps
13 = 13 Amps
15 = 15 Amps
16 = 16 Amps
20 = 20 Amps

25 = 25 Amps
30 = 30 Amps
32 = 32 Amps
40 = 40 Amps
50 = 50 Amps
63 = 63 Amps

3