Cutler Hammer, Div of Eaton Corp WMZT General Product Line Information
UL 489 DIN Rail Miniature Circuit Breakers
WMZT Circuit Breakers
Product Overview
UL 489 DIN Rail Miniature Circuit Breakers
WMZT Circuit Breakers
PRODUCT OVERVIEW
Optimum and Efficient Protection for Every Application
Product Overview
Optimum product quality, tested reliability and safety stand for
best protection of personnel, installations and plant. Eaton’s
WMZT DIN rail mountable circuit breaker is designed for use in
branch service applications.
Powerful Offering for Machine and System Builders
The WMZT is available with C and D characteristics in accordance
with UL 489, CSA C22.2 No.5; UL 1077, CSA C22.2 No.235
and IEC 60947-2.
Typical Applications
Feeder and Branch Circuit Protection
• Convenience receptacle circuits (internal / external)
• Motor control circuits
• Load circuits leaving the equipment (external)
• HACR Equipment (Heating, Air Conditioning, Refrigeration)
(internal / external)
• PLC I/O points
• Computers
• Power supplies
• Control instrumentation
• Relays
• UPS
• Power conditioners
Features
• Complete range of UL 489 listed DIN rail mounted miniature
circuit breakers up to 40 ampere current rating
• Complete family rated for 10 kAIC @ 277/480 Vac
• Current limiting design provides fast short circuit interruption
that reduces the let-through energy, which can damage the
circuit
• Suitable for branch circuit device protection
• Thermal-magnetic overcurrent protection
— Two levels of short circuit protection, categorized by
C and D curves
• Trip-free design — breaker can not be defeated by holding the
handle in the “on” position
• Captive screws cannot be lost
• SWD (switching duty) — suitable for switching fluorescent
lighting loads (I
• Fulfill UL 489, CSA C22.2 No.5 and also IEC 60947-2 Standard
• For use in applications for which UL 1077 or CSA C22.2
≤ 20A)
n
No.235 are also allowed
• Field installable shunt trip and auxiliary switch subsequent
mounting
• Separate version for ring torque connection (Type WMZT….T),
terminal screws can be removed (on both sides)
• Module width of only 17.7 mm (per pole)
• Contact Position Indicator (red / green)
• Easy installation on DIN rail
• Possibility for sealing the toggle in “on” or “off” position
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EATON CORPORATION UL 489 DIN Rail Miniature Circuit Breakers
UL 489 DIN Rail Miniature Circuit Breakers
WMZT Circuit Breakers
PRODUCT OVERVIEW
WMZT Complies with the Latest National and
International Standards
Standards — Feeder and Branch Circuit Protection
UL 489
Standard for molded case circuit breakers
(MCCB) for feeder and branch circuit protection.
Products meet the requirements
of the National Electrical Code
®
(NEC®).
CSA C22.2 No.5
Standard for molded case circuit breakers
(MCCB) for feeder and branch circuit protection
(corresponds closely to UL 489 Standard).
Products meet the requirements of the
Canadian Electrical Code (CEC).
Tripping characteristics
Eaton WMZT branch circuit breakers are available with “C” and
“D” tripping characteristics.
C-curve devices are suitable for application where medium levels
of inrush current are expected. Applications include small transformers, lighting, pilot devices, control circuits, and coils. C-curve
devices provide a medium magnetic trip point.
D-curve devices are suitable for applications where high levels
of inrush current are expected. The high magnetic trip point
prevents nuisance tripping in high inductive applications such as
motors, transformers and power supplies.
Eaton WMZT devices are current limiting, which means they
interrupt fault currents within one half cycle of the fault. Current
limiting devices offer superior protection by reducing peak
let-through current and energy.
tripping characteristic
acc. to UL 489
conventional non-tripping
current
= 1.0 IN (T=40°)
I
nt
conventional tripping current
= 1.35 IN: t < 1 h (T=25°)
I
t
2.0 IN: t = 12 – 120 s (T=25°)
instantaneous tripping
acc. to IEC 60898-1
type C: 5 IN: t > 0.1 s
10 I
type D: 10 IN: t > 0.1 s
20 I
: t < 0.1 s
N
: t < 0.1 s
N
Device Printing on Front and Side
Installation options
WMZT branch circuit breakers are available in two terminal
configurations; standard box terminals that accept multiple
conductors and ring-tongue terminals, ideally suited to demanding
requirements of the semi-conductor industry. All breakers mount
on standard 35 mm DIN rail. Bus connectors and feeder terminal
facilitate mounting and wiring of multiple miniature circuit breaker
arrays in control panel assemblies. WMZT circuit breakers can
also be reverse feed.
Conductor
Type
Breaker Status
Indicator
Calibration
Temperature
UL/CSA
Rated Current
Rated Voltage
UL/CSA
Catalog Number
Product Overview
EATON CORPORATION UL 489 DIN Rail Miniature Circuit Breakers
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