Curtis Instruments / Albright International

CURTIS / ALBRIGHT

DC Contactors & Disconnect Switches

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)

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”.

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?

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…

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


DPST, DPDT

Economy Circuit

Motor Reversing

SW180 & 190 Series


SPST, SPDT, DPST

Motor Reversing


SW200 Series


SPST, SPDT

Motor Reversing


SU Series

100A – 250A Interrupted

100A - 350A Uninterrupted

SPST, DPST

IP66 Compliance

Motor Reversing

Busbar Series


SPST, DPST, SPDT

ED Manual Disconnect Switches


SP, DP, SPST

Lockable

SD Combined Manual Disconnect & Line Contactor


SP

Lockable

SPST- Single Pole/Single Throw , SPDT- Single Pole/Double Throw

DPST- Double Pole/Single Throw, DPDT- Double Pole/Double Throw

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 ShieldsARC 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

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

Thank You!

&

From

Sales

Curtis Instruments / Albright International