Application Data
Average Operating Times In Milliseconds
| Device | Pick-Up | Drop-Out |
|---|---|---|
| AC Relay | 15 | 16 |
| AC Latching Relay | 15 | 13 |
| DC Relay | 37 | 21 |
| DC latching Relay | 37 | 45 |
Voltage Range:
AC operation, +10/-15%
DC operation, +10/-20%
In the case of dual rated DC coils, the range is +10% of the larger number and -20% of smaller number.
Operating Temperature Range:
-40°C to +71°C
-40°F to +160°F
Contact Ratings
| Top of Cartridge | AC Ratings | |||||||
|---|---|---|---|---|---|---|---|---|
| Volts | Inductive 35% Power Factor | Resistive 75% Power Factor | ||||||
| NEMA Rating | Make | Break | Continuous Amperes | Make, Break and Continuous Amperes | ||||
| Amperes | VA | Amperes | VA | |||||
| Standard | 120 | A600 | 60 | 7200 | 6 | 720 | 10 | 10 |
| 240 | 30 | 7200 | 3 | 720 | 10 | 10 | ||
| 480 | 15 | 7200 | 1.5 | 720 | 10 | 10 | ||
| Overlapping | 600 | 12 | 7200 | 1.2 | 720 | 10 | 10 | |
| Master* | — | A600 | Same as standard cartridge above except substitute 20 Ampere for the continuous Ampere rating | |||||
| Logic Reed | — | — | 150 Vac, 150MA, 8W Maximum | |||||
| Top of Cartridge | DC Ratings | |||||
|---|---|---|---|---|---|---|
| Volts | Inductive | Resistive | ||||
| NEMA Rating | Max. Make and Break Amperes (138VA Max. for 300 V or Less) | Continuous Amperes | Make and Break Amperes | Continuous Amperes | ||
| Standard | 125 | P600 | 1.1 | 5 | 4 | 5 |
| 250 | 0.55 | 5 | 0.8 | 5 | ||
| 301–600 | 0.20 | 5 | — | — | ||
| Overlapping | 125 | P150 | 1.1 | 5 | 4 | 5 |
| Master* | 125 | P600 | 1.1 | 5 | 4 | 5 |
| 250 | 0.55 | 5 | 0.8 | 5 | ||
| 301–600 | 0.20 | 5 | — | — | ||
| Logic Reed | — | — | 30 Vdc, 60MA | |||
Contact Arrangement
The following tables list all pole arrangements and the location
of the N.O. and
N.C. poles. Relays purchased from the
factory will correspond to these tables. For example: an XO12 will
have one N.O. pole in position 1; positions 2 and 3 will have N.C.
poles; position 4 will be a space.
2, 3, and 4–Pole Relay—All contacts convertible
| No. of Poles | Type | Pole Number* | |||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | ||
| 2 | S | O | O | S | |
| S | O | 1 | S | ||
| S | 1 | 1 | S | ||
| 3 | O | O | O | S | |
| O | 1 | O | S | ||
| O | 1 | 1 | S | ||
| 1 | 1 | 1 | S | ||
| 4 | O | O | O | O | |
| O | 1 | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | 1 | ||
| 1 | 1 | 1 | 1 | ||
6 and 8–Pole Relay—All contacts convertible
| No. of Poles | Type | Pole Number* | |||
|---|---|---|---|---|---|
| 5 | 6 | 7 | 8 | ||
| 1 | 2 | 3 | 4 | ||
| 6 | S | O | O | S | |
| O | O | O | O | ||
| S | O | O | S | ||
| O | 1 | O | O | ||
| S | O | O | S | ||
| O | 1 | 1 | O | ||
| S | 1 | 1 | S | ||
| O | 1 | O | O | ||
| S | 1 | 1 | S | ||
| O | 1 | 1 | O | ||
| S | 1 | 1 | S | ||
| O | 1 | 1 | 1 | ||
| S | 1 | 1 | S | ||
| 1 | 1 | 1 | 1 | ||
| 8 | O | O | O | O | |
| O | O | O | O | ||
| O | 1 | O | O | ||
| O | O | O | O | ||
| O | 1 | 1 | O | ||
| O | O | O | O | ||
| O | 1 | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | 1 | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| 1 | 1 | 1 | 1 | ||
| O | 1 | 1 | 1 | ||
| 1 | 1 | 1 | 1 | ||
| 1 | 1 | 1 | 1 | ||
| 1 | 1 | 1 | 1 | ||
10 and 12–Pole Relay—All contacts convertible
| No. of Poles | Type | Pole Number* | |||
|---|---|---|---|---|---|
| 9 | 10 | 11 | 12 | ||
| 5 | 6 | 7 | 8 | ||
| 1 | 2 | 3 | 4 | ||
| 10 | S | O | O | S | |
| O | O | O | O | ||
| O | O | O | O | ||
| S | O | O | S | ||
| O | 1 | O | O | ||
| O | O | O | O | ||
| S | O | O | S | ||
| O | 1 | 1 | O | ||
| O | O | O | O | ||
| S | O | O | S | ||
| O | 1 | 1 | O | ||
| O | 1 | O | O | ||
| S | O | O | S | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| S | O | O | S | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| S | 1 | 1 | S | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| S | 1 | 1 | S | ||
| O | 1 | 1 | 1 | ||
| O | 1 | 1 | O | ||
| S | 1 | 1 | S | ||
| O | 1 | 1 | O | ||
| 1 | 1 | 1 | 1 | ||
| 8 N.C. Poles Maximum | |||||
| 12 | O | O | O | O | |
| O | O | O | O | ||
| O | O | O | O | ||
| O | 1 | O | O | ||
| O | O | O | O | ||
| O | O | O | O | ||
| O | 1 | 1 | O | ||
| O | O | O | O | ||
| O | O | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | O | O | ||
| O | O | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | O | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | O | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | 1 | ||
| O | 1 | 1 | O | ||
| O | 1 | 1 | O | ||
| 1 | 1 | 1 | 1 | ||
| 8 N.C. Poles Maximum | |||||
Control Relay*
XTD and XTE Timer Attachments—All contacts convertible
| No. of Poles Timed Contacts | Type | Pole Number* | |
|---|---|---|---|
| 13 | 14 | ||
| 2 | O | 1 | |
Replacement AC Magnet Coils For Relays
| Equipment to be serviced | Coil Prefix or Class and Type | Hz | Suffix Number (Complete Coil Number consists of Prefix or Class and Type followed by Suffix Number) |
Coil Volt-Amperes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class | Type | Poles | 24 Volts | 110–115 Volts | 120 Volts | 208 Volts | 220 Volts | 240 Volts | 277 Volts | 380 Volts | 440 Volts | 480 Volts | 550 Volts | 600 Volts | Inrush | Sealed | ||
| 8501 | X | All | 9998-X | 60 | 23 | — | 44 | 51 | 52 | 53 | 55 | — | — | 62 | — | 65 | 148 | 23 |
| 50 | 24 | 44 | — | 52 | 53 | — | — | — | 62 | — | 65 | — | 143 | 25 | ||||
Replacement DC Magnet Coils For Relays
| Equipment to be serviced | Coil Prefix or Class and Type | Suffix Number (Complete Coil Number consists of Prefix or Class and Type followed by Suffix Number) |
Coil Burden Watts | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class | Type | Poles | 6 Volts | 12 Volts | 18 Volts | 24 Volts | 32 Volts | 48 Volts | 64 Volts | 72 Volts | 90 Volts | 110 Volts | 115/125 Volts | 220 Volts | 230/250 Volts | ||
| 8501 | XD | All | 9998 XD | 19 | 28 | 34 | 37 | 40 | 46 | 49 | 52 | 55 | — | 58 | — | 67 | 18 |
| XDL | — | 9998 XDL | 19B | 28B | 34B | 37B | 40B | 46B | 49B | 52B | 55B | — | 58B | — | 67B | 50 | |
| XUD | All | 9998 XUD | 19 | 28 | — | 37 | — | 46 | — | — | — | — | 58* | — | 67* | 16 | |
Definition of Ratings
Control relays are designed for switching inductive and resistive loads in both AC and DC circuits. By far, the greatest number of applications involve the switching of inductive loads in AC circuits. Typical loads include solenoids and operating coils of such devices as other relays, timers, starters and contactors.
The magnets on AC devices exhibit an inrush current when first switched on, with the current subsiding to some lesser value, known as the sealed current, after the magnet has moved to its sealed position. DC devices do not have an inrush current when first energized. Relay contacts may also be called upon to carry current continuously for long periods of time. This has resulted in recognizing three important ratings for relay contacts: the make rating, break rating and the continuous current rating. In addition, ratings are further divided into categories which depend upon whether the load is resistive or inductive in nature.
Contact Ratings
Contact Ratings on shows current and VA (volt-ampere) values in sufficient detail for most applications. A short definition of some of the terms used in the table follow:
-
Resistive Rating - Indicates the resistive load that the contacts can make, break or carry continuously. Resistive ratings are based on a 75% power factor.
-
Inductive Rating - Refers to loads such as coils of contactors, starters and relays and solenoids that contacts can make, break and carry continuously. Inductive rating tests are run with 35% power factor load.
-
Make Rating - Applies to the current that can be han-dled by the contact at the time of contact closure. In in-ductive AC circuits, the momentary inrush current is often 10 times the sealed current, and a relay must be able to handle this inrush current as well as be able to break it in an emergency. The endurance test listed in NEMA Standard ICS 5-1993 Paragraph 8 requires relay contacts to make the make rating for 6,000 operations.
-
Break Rating - Refers to the current that can be interrupted successfully by the contact. The inductive break rating is always less than the resistive or continuous ratings. When contacts break an inductive circuit, the inductance of the load tends to maintain the current. The result is an arc across the contacts which causes heating and erosion of the contacts. Because of the extra heat generated, the allowable inductive current must be less than the resistive current for equal contact life. The endurance test from NEMA Standard ICS 5-1993 Paragraph 8 requires relay contacts to interrupt the break rating for 6,000 operations. It also requires relay contacts to interrupt the make rating for 6 operations in an emergency.
-
Continuous Rating - Continuous rating indicates the load that the contacts can carry continuously without making or breaking the circuit and without exceeding a certain temperature rise.
Contact Life
The life of control relay contacts depends upon the magnitude and characteristics of the electrical load, inductance, duty cycle, mechanical properties of the device in which they are used, voltage fluctuations, environment, etc. The Class 8501 Type X relay carries a NEMA A600 rating. NEMA A600 relays have 600 VAC spacings, a 10 ampere continuous rating, a 60 ampere make rating, and a 6 ampere break rating at 120 volt AC for an AC inductive load.
When control circuit relays are operated at maximum rated load, the life of the contact is usually less than that of the mechanical life of the device. If the application requires a large number of operations during the life of the contacts, the contacts must be applied at values less than their maximum make and break ratings. NEMA Standard ICS 5-1993 Paragraph 8 recommends that control relays for automatically-operated sequencing systems be utilized with loads of less than 25% of the 60 ampere make and 6 ampere break ratings. It does not recommend using a relay at its maximum ampere rating where the number of operations are expected to substantially exceed the 6000 operations required by the endurance test in NEMA Standard ICS 5-1993 Paragraph 8.
Life-Load Guide
The information shown is provided to estimate the service life of a Class 8501 Type X control relay. This information is not to be taken as a guarantee, but rather an approximate life expectancy. The information is based on the following:
-
Operating 40 hours per week
-
Operating 52 weeks per year
-
Inrush and continuous current ratings not exceeded • Application in usual service conditions (such as described in NEMA Standard ICS 1-1993 Paragraph 6)
-
Operating at 120 Volts 60 Hertz