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Features and Benefits
The SEL-9502 Contact Arc Suppressor allows high-speed trip and close
contacts to interrupt trip and close current without damage.
Protective relay output contacts are usually rated to interrupt limited dc
current. For example, SEL rates standard output contacts to interrupt 0.3 A in
a 125 Vdc circuit. The SEL-9502 allows standard output contacts in SEL
relays or other equipment to interrupt up to 15 A in an inductive dc circuit.
Apply the SEL-9502 wherever a high-speed contact needs to safely, reliably,
and repeatedly switch large, high-speed inductive dc loads.
➤
Interrupt up to 15 A in an inductive dc circuit up to 250 Vdc.
➤
Protect high-speed trip and close contacts from being damaged
when they interrupt trip or close current due to a failed circuit
breaker or malfunctioning auxiliary switch.
➤
Reduce maintenance on contacts subject to repetitive
switching.
Date Code 20150126
Contact Arc Suppressor
Instruction Manual
Instruction Manual
SEL-9502
SEL-9502 Contact Arc Suppressor
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Table of Contents
Summary of Contents for Sel SEL-9502
- Page 1 Protective relay output contacts are usually rated to interrupt limited dc current. For example, SEL rates standard output contacts to interrupt 0.3 A in a 125 Vdc circuit. The SEL-9502 allows standard output contacts in SEL relays or other equipment to interrupt up to 15 A in an inductive dc circuit.
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Page 2: Safety Information
Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate injury or equipment damage. Safety Symbols The following symbols are often marked on SEL products. CAUTION ATTENTION Refer to accompanying documents. Se reporter à la documentation. -
Page 3: Safety Marks
Terminal Blocks: 1.7 Nm (15 in-lbs) Borniers : 1,7 Nm (15 livres-pouce) Installing the SEL-9502 The SEL-9502 is self-powered and easy to install in new circuits or retrofit into existing installations. Figure 1 shows how to connect the SEL-9502. The SEL-9502 connects to both sides of the protected contact to sense when the contact is open. - Page 4 4 Installing the SEL-9502 The lead connecting the SEL-9502 to the switched load can be as long as necessary. + dc Trip Isolation Switch TRIP (+) Red (–) Black SEL-9502 Trip Isolation Switch Trip Coil – dc Figure 1 Typical SEL-9502 Installation...
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Page 5: Application Guidelines
Application Guidelines Low Load Current (Less Than One Amp) To apply the SEL-9502 to circuits with load current less than 1 A, wrap the negative terminal lead through the hole in the SEL-9502 twice, as shown in Figure 2. Placing two turns through the current sense circuit of the SEL-9502 allows it to reliably sense currents as low as 0.4 Adc. - Page 6 When opening, the contacts must have sufficient physical separation after 2 ms to withstand 500 V. Most contacts meet this requirement, as a separation of even 1 mm easily withstands 500 V. Do not use the SEL-9502 to protect reed relays.
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Page 7: Mechanical Diagram
Arc Suppressor Operation (Patent Pending) The SEL-9502 suppresses the arc that normally forms across contacts when they open while carrying dc current. When the SEL-9502 senses the contact is opening and is carrying current, it momentarily diverts the load current around the contact, allowing the contact to open with very little or no arcing. - Page 8 8 Arc Suppressor Operation (Patent Pending) the current flowing through the contact to decrease. If the SEL-9502 senses that the current through the contacts drops, it continues to divert current around the opening contacts for another 2 to 3 ms, giving the contacts time to separate.
- Page 9 SEL-9502 terminates the arc suppression operation after less than 100 µs. In other words, the SEL-9502 energizes the load for no more than 100 µs when the circuit is energized. After the circuit is energized, the SEL-9502 remains off even during transients in the dc control wiring.
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Page 10: Specifications
–40° to +85°C –40° to +185°F Type Tests Electromagnetic Compatibility EN 50263:1999 IEC 61000-4-6, First Edition:1996 ENV 50204:1995 IEC 61000-4-2, First Edition:1995 Fast Transient/Burst Immunity IEC 61000-4-4, First Edition:1995 IEC 60255-22-4, First Edition:1992 SEL-9502 Contact Arc Suppressor Instruction Manual Date Code 20150126... -
Page 11: Factory Assistance
Factory Assistance Factory Assistance We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 USA Telephone: +1.509.332.1890 Fax: +1.509.332.7990 Internet: www.selinc.com... - Page 12 Schweitzer Engineering Laboratories, Inc. has approved only the English lan- guage document. This product is covered by the standard SEL 10-year warranty. For *PM9502-01* warranty details, visit www.selinc.com or contact your customer service representative.
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