12HFA51A42H - HFA Multicontact Auxiliary Relay

SPECIFICATIONS:

Part Number: 12HFA51A42H
Manufacturer: General Electric
Product Type: HFA Multicontact Auxiliary Relay
Power Requirements: +5 V dc, 6 A
Number of relay channels: 12
Coil Voltage: 125 VDC
Operating temperature: -30 to +65°C
Size: 12 x 12 x 12 inches
Repair: 3-7 Day
Availability: In Stock
Weight: 2.99 kg
Country of Origin: United States
Manual: GEH-2024F

FUNCTIONAL DESCRIPTION:

12HFA51A42H is an HFA Multicontact Auxiliary Relay manufactured and designed by General Electric and used in GE Speedtronic Control Systems. The HFA relay is designed for applications where several auxiliary functions must be performed simultaneously. Six contacts are provided. If more than six circuits are to be controlled, the coils of two or more relays may be connected in series (DC only) or in parallel. All HFA relays have six electrically separate contact circuits adaptable for either circuit-opening or circuit-closing applications. The HFA relays are available for front or back connection. The front-connected relays are suitable for surface mounting only. The back connected relays are suitable for either surface mounting or semi-flush mounting a steel flange is provided for the latter.

The HFA relay is also available in an S2 draw-out case. Selection of DC relays for tripping duty where the operating coil circuit is opened by an auxiliary switch. The operating time of the standard HFA relay is approximately 5 cycles for the DC models (60 Hz basis). If used on DC for tripping a circuit breaker, the operating time should be reduced to approximately 1 cycle so that no appreciable time delay will be added to the operating time of the protective relay. This can be accomplished by selecting a relay that has a lower voltage rating than the control circuit. When so applied, the HFA operating coil must be opened by the breaker auxiliary switch to prevent overheating. The increased current through the HFA operating coil will ensure the operation of the target on the protective relay

CONTACT RATING:

Contacts are electrically separate and easily reversible from normally open to normally closed or vice versa. The current closing rating of the contacts is 30 A. The current-carrying rating is 12 A continuously or 30 A for 1 min. The HFA51 and 71 relays are instantaneous, hinged armature, six contact auxiliary relays supplied in either a drawout or non-drawout case for panel mounting.

TIME DELAY APPLICATIONS:

The HFA65D relays are similar to the HFA51 relays except they have adjustable time-delay dropout. Although the HFA65D relay has a time delay dropout adjustable from 0.25 sec to 2.0 sec, it is normally set for 2 sec at the factory unless otherwise specified. The HFA65E relays have an adjustable time-delay pickup with a fixed time dropout of 0.25 sec. Pickup is normally set for 0.083 sec unless otherwise specified.

HIGH-SPEED TRIPPING:

The HFA53K relays are designed to have a pickup time of 9 ms (one-half cycle—60 Hz basis). The required external resistor is included in the basic model number. Since one contact is used for the operating coil transfer circuit, only five contacts are available for external circuits. The HFA73K is a high-speed tripping relay with a pickup time of not more than 9 ms. The required series resistor is built into the relay. Since one contact is used for the operating coil transfer circuit, only five contacts are available for external circuits

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FREQUENTLY ASKED QUESTIONS:

What is an HFA Multicontact Auxiliary Relay?

The HFA Multicontact Auxiliary Relay is a versatile relay used in industrial control systems, such as GE Speedtronic Control Systems. It has multiple contacts (typically six) that can simultaneously control different circuits. The relay is designed for applications requiring several auxiliary functions.

What is the high-speed tripping capability of the HFA relay?

HFA53K and HFA73K relays are designed for high-speed tripping, with a pickup time of 9 ms (one-half cycle at 60 Hz). These relays are ideal for fast protection circuits, especially in critical systems.

How many contacts does the HFA relay have, and how can they be used?

The HFA relay is equipped with six electrically separate contacts. These contacts can be configured either as normally open (NO) or normally closed (NC), making the relay suitable for both circuit-opening and circuit-closing applications.