PAB2-Y3-3 EATON HEINEMANN, PAB2-Y3-3 Datasheet - Page 5

• Manufacturer Part Number: PAB2-Y3-3
• Description: CIRCUIT BREAKER, HYD-MAG, 2P, 250V, 20A
• Manufacturer: EATON HEINEMANN
• Series: PROPAKr

Specifications of PAB2-Y3-3

• Input Voltage Vac: 250V
• No. Of Poles: 2
• Current Rating: 20A
• Interrupting Capacity: 1kA
• Dielectric Strength: 2kV
• Trip Time: 0.1s
• Voltage Rating Vdc: 50V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A Look Inside
The Hydraulic Principal
The hydraulic-magnetic technol-
ogy used in the Heinemann line
of circuit breakers delivers
precision protection and a
controlled response to changes
in load current. Utilizing a coil of
wire to measure the magnetic
flux produced in the circuit, in
combination with the dampen-
ing effect of an oil-filled tube,
Heinemann circuit breakers
provide reliable, consistent
protection characteristics in
all environments.
1.
Pressure connector, threaded stud, hook, bus, plug-in and quick-connect terminals (with
holes for optional soldering) are available.
2.
Sliding pivot point causes a wiping action across the contacts each time a breaker is
switched. This cleaning motion helps keep surface resistance low, extending contact
life. (Contacts are made of silver alloy for minimal wattage loss.)
3.
U-shaped grid plates quickly draw out, fragment and extinguish contact arc. Charring
and pitting are minimized.
4.
Strong, durable and highly efficient. Latch is shock-resistant, yet provides very fast oper-
ation. Trip-free construction makes it impossible to hold the breaker closed against a
fault. (Even when handle is held in ON position, contacts trip free of fault condition.)
5.
Counterbalanced armature design helps prevent mechanical tripping caused by shock
and vibration. Meets MIL-STD-202 requirements.
6.
Two handle positions, ON and OFF (no ambiguous “reset” position). After fault clear-
ance, simply snap the handle back to ON.
7.
Magnetic unit measures current, not temperature, making it unnecessary to derate for
high-ambient service. Coil will carry 100% rated load as specified in the appropriate
response curve.
8.
Circuit breakers are housed in special plastic casings that significantly reduce fungal
growth and contamination.
Broad Selection of Terminal Styles
Self-Cleaning Contacts
Efficient Blowout Grid
Sturdy Toggle and Latch
Balanced Armature
Two-Position Switching
Load-Sensing Coil
Fungus-Resistant Case
The Heinemann hydraulic-
magnetic circuit breaker oper-
ates on load-current produced
magnetic flux variation in a sole-
noid. The coil is wound around
a hermetically sealed, non-
magnetic tube containing a
spring-loaded, moveable iron
core and a silicone liquid fill.
With the load current either
at or below the breaker’s nomi-
nal rating, the magnetic flux is
of insufficient strength to move
the core, and it remains at
the end of the tube opposite
the armature.
On an overload, the magnetic
flux force increases, pulling the
iron core into the coil toward the
armature end of the tube. This
core insertion reduces the reluc-
tance of the magnetic circuit
and further increases the
strength of the magnetic field.
The silicone liquid regulates the
core’s speed of travel, creating a
controlled trip delay that is
inversely proportional to the
magnitude of the overload. If
the overload subsides before
the core reaches the pole piece,
the core returns to its original
position, and the breaker does
not trip. (For non-delay applica-
tions, the breaker is modified to
omit the intentional delay.)
EATON CORPORATION Application Information
When the magnetic flux
reaches a predetermined value,
the armature is attracted to
the pole piece and the breaker
trips. (The breaker may trip
before the core reaches the
pole piece if the critical flux
value is achieved first.) On
very heavy overloads or short
circuits, the flux produced by
the coil above, regardless of
core position, is sufficient to
pull in the armature. This
circuit interruption occurs
with no intentional delay —
a highly desirable response
characteristic.
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