Relays, Timers, and Temperature Controllers

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General Information

Contact Data Tables NEMA Ratings and Test Values Surge Suppression Information Solid-State Relay Glossary
NEMA Ratings and Test Values

NEMA Ratings and Test Values for AC Control Circuit Contacts at 50 or 60 Hz

Maximum Current [A]
NEMA Contact Rating Designation Thermal Continuous Test Current [A] 120V 240V 480V 600V VA
Make Break Make Break Make Break Make Break Make Break
A150 10 60 6.00 7200 720
A300 10 60 6.00 30 3.00 7200 720
A600 10 60 6.00 30 3.00 15 1.50 12 1.20 7200 720
B150 5 30 3.00 3600 360
B300 5 30 3.00 15 1.50 3600 360
B600 5 30 3.00 15 1.50 7.5 0.75 6 0.60 3600 360
C150 2.5 15 1.50 1800 180
C300 2.5 15 1.50 7.5 0.75 1800 180
C600 2.5 15 1.50 7.5 0.75 3.75 0.375 3 0.30 1800 180
D150 1.0 3.60 0.60 432 72
D300 1.0 3.60 0.60 1.8 0.30 432 72
D600 0.5 1.80 0.30 216 36
2X A300 20 120 12 60 6.00 14400 1440
2X A600 20 120 12 60 6.00 30 3.00 24 2.40 14400 1440
  

NEMA Ratings and Test Values for DC Control Circuit Contacts

Maximum Current [A]
NEMA Contact Rating Designation Thermal Continuous Test Current [A] 5…28V 125V 250V 301…600V Make or Break at 300V or less [VA]
N150 10 10 2.2 275
N300 10 10 2.2 1.1 275
N600 10 10 2.2 1.1 0.40 275
P150 5.0 5.0 1.1 138
P300 5.0 5.0 1.1 0.55 138
P600 5.0 5.0 1.1 0.55 0.20 138
Q300 2.5 2.5 0.55 0.27 0.11 69
Q600 2.5 2.5 0.55 0.27 0.11 69
2X P600 10 10 2.2 1.1 0.40 275
  

Solid-State Relays Data Tables

Click to enlarge - soldstatedata


⋆  Requires a heak sink to reach maximum current value.


NEMA Definitions for Contact Arrangements

Form “A” Contacts

A Form A contact arrangement is one that has single-pole, single-throw, normally open contacts. The function of this arrangement is to close a circuit when actuated.

Click to enlarge - Relays_Timers-20-1


Form “B” Contacts

A Form B contact arrangement is one that has single-pole, single-throw, normally closed contacts. The function of this arrangement is to open a circuit when actuated.

Click to enlarge - Relays_Timers-20-2


Form “C” Contacts

A Form C contact arrangement is one that has single-pole, double-throw contacts with three terminals - one for normally open, one for normally closed, and one common. The function of this arrangement is to transfer a circuit when actuated.

Click to enlarge - Relays_Timers-20-3


Form “X” Contacts

A Form X contact arrangement is one which has single-pole, single-throw, normally open double-make contacts. The function of this arrangement is to close a circuit when actuated.

Click to enlarge - Relays_Timers-20-4


Form “Y” Contacts

A Form Y contact arrangement is one that has single-pole single-throw normally closed double-break contacts. The function of this arrangement is to open a circuit when actuated.

Click to enlarge - Relays_Timers-20-5


Form “Z” Contacts

A Form Z contact arrangement is one that has single-pole, double-throw, contacts with four terminals — two for normally open and two for normally closed. The function of this arrangement is to open one circuit and close the other.

Click to enlarge - Relays_Timers-20-6


Click to enlarge - Relays_Timers-28-3


Repeat Cycle or (Flicker)

Power is applied continuously. When a start signal is applied, the timing cycle begins. When the time delay is completed, the output contacts change state and the next timing cycle begins. This cycle will repeat until a reset signal is applied or power is removed.

Click to enlarge - Relays_Timers-28-4


Flexibility

Mounting — Timing relays are available in several different models. They can be plugged into the same socket as the relay, or use a separate plug-in socket mounting.
Contacts — The contacts are of various types and ratings. Refer to the appropriate specification pages for more details.
Functionality — Timing relays with multi-range and multi-function capability are available. This allows you to stock one relay to cover a wide variety of applications.
External Trigger Switch — OFF-Delay, One-Shot, and other timer functions require an external trigger switch (from a relay or push button) to control the timing function. The external trigger switch will cause the timing function to start. In OFF-Delay, the trigger switch closes to energize the output and when the trigger switch opens the OFF-Delay starts to time out. At the end of the time delay, the output is de-energized and the output contacts return to their shelf state.