DC Contactor Overview

1. CURTIS / ALBRIGHT

2. DC Contactors & Disconnect Switches

3. Agenda
Curtis Instruments and Albright International Partnership
Contactor Basics
Markets and Applications Served
Product Line (SW, PC, SU, ED, & SD Series)
Contactor Options
Contactor Sizing (Application Form)

4. A Partnership of Success
The “Gentlemen’s Agreement”
Edward Marwell (Former CEO/President and founder of Curtis
Instruments) was approached by Nigel Bedggood (President of
Albright International) at a materials handling exposition in the UK
during the late 70’s.
The two businessmen starting talking about their products and
business strategies and found that they had a lot in common.
During Mr. Bedggood’s next business trip to the United States he set
up a meeting with Mr. Marwell at Curtis’ Mt. Kisco, NY office to talk
about a joint venture between their two companies.
In September of 1978 on a handshake, Curtis Instruments was made
an exclusive US supplier of Albright DC contactors and disconnect
switches. For nearly 40 years it has truly been a “Partnership of
Success”.

5. Contactor Basics
A contactor is an electrically controlled switch used
for switching a power circuit, similar to a relay except
with higher current ratings.
A contactor is controlled by a circuit which has a
much lower power level than the switched circuit.
What is a contactor?The three main components of a contactor
1. Contacts - Current carrying part of the
contactor, i.e. power contacts, auxiliary
contacts, contact springs.
2. Coil - provides the driving force to close the
contacts.
3. Enclosure - A frame, housing the contacts
and electromagnet-(coil).
1. Current is passed through an electromagnet (Coil)
2. The current creates a magnetic field around the wire which then induces a magnetic
field around the iron core.
3. This magnetic field closes the main circuit inside the contactor thus allowing the
passing of current.
4. The moving contacts are propelled by the moving core (plunger assembly), the force
developed by the coil holds the moving and fixed contacts together.
5. When the contactor coil is de-energized, a spring returns the electromagnet core to
it’s initial position and opens the contacts.
How does a contactor work?

6. Markets & Applications
Heavy Equipment Industrial Automotive Renewable Energy
Medical Materials HandlingTelecom Electric Vehicles
Just SOME of the markets and applications our DC contactors are used on…

7. Product Offering
SW60 Series
 80A
 SPST, SPDT, DPST
 IP66 Compliance
 Monoblock Design (DC6xP)
PC60 Series
 80A
 PCB Mounted
 SPST, SPDT
 IP66 Compliance
 Monoblock Design (MB6x)
SW80 Series
 100A Interrupted / 125A Uninterrupted
 SPST, SPDT, DPST
 Motor Reversing
 IP66 Compliance
 Monoblock Design (DC8x)
SW120 Series
 125A Interrupted / 125A Uninterrupted
 DPST, DPDT
 Economy Circuit
 Motor Reversing
SW180 & 190 Series
 150A Interrupted / 200A Uninterrupted
 SPST, SPDT, DPST
 Motor Reversing
 Monoblock Design (DC18x)
SW200 Series
 250A Interrupted / 400A Uninterrupted
 SPST, SPDT
 Motor Reversing
 Monoblock Design (DC18x)
SU Series
 100A – 250A Interrupted
 100A - 350A Uninterrupted
 SPST, DPST
 IP66 Compliance
 Motor Reversing
Busbar Series
 140A - 2400A Uninterrupted
 SPST, DPST, SPDT
ED Manual Disconnect Switches
 80A - 1800A Uninterrupted
 SP, DP, SPST
 Lockable
SD Combined Manual Disconnect & Line Contactor
 125A - 300A Uninterrupted
 SP
 Lockable
SPST- Single Pole/Single Throw , SPDT- Single Pole/Double Throw
DPST- Double Pole/Single Throw, DPDT- Double Pole/Double Throw

8. Contactor Options
Curtis / Albright offers many options to add on to the contactors to fit your application’s needs.
Here are some of the major options below:
Auxiliary Contacts Mounting Brackets
Dust Shields
ARC Suppression
 Magnetic Blowouts
 Steel Shrouds (UL583 for EE Trucks)
 Large, Silver Plating, & Textured Tips Contacts
 AC Rectifier Board
 Plus much more!
Continuous (100%) Prolonged (90%)
Intermittent (70%) High Powered (25%)
Various Coil Duty Cycles

9. Application Form
For your convenience, Albright has devised a application form that must be filled out. Completing this form
entirely with the correct information will ensure you will be sized with right contactor for your application

10. Thank You!
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