KRDR321B4 [Littelfuse]

Name: KRDR321B4
Brand: Littelfuse
SKU: KRDR321B4
Availability: InStock

Part No:

KRDR321B4

Category:

Relays, Contactors & Solenoids

Manufacturer:

Littelfuse

Description:

Compact time-delay relay with solid-state timing circuit for excellent repeat accuracy and stability.

Datasheet:

Stock Status:

Available for RFQ

Pricing:

Request Volume Pricing

Quote Response:

Within 24 Hours

Shipping:

In-stock parts ship in 1–2 business days

Specification

Type

Parameter

Insulation Resistance

≥ 100MΩ

Operating Humidity

95% relative, non-condensing

Operating Temperature

-20°C ~ 60°C

Weight

2.6 oz (74 g)

Storage Temperature

-40°C ~ 85°C

Ac Line Frequency Dc Ripple

50/60Hz / ≤ 10%

Contact Form

SPDT

Contact Max Switching Voltage

250VAC

Contact Rating

10A resistive @ 125VAC; 5A resistive @ 230VAC & 28VDC; 1/4 hp @ 125VAC

Dimensions

H 50.8 mm (2”), W 50.8 mm (2”), D 30.7 mm (1.21”)

Factory Calibration Tolerance

≤ ±5%

Input Voltage

12, 24 or 110VDC; 24, 120 or 230VAC

Input Voltage Tolerance 110 120 230V

-20% -10%

Input Voltage Tolerance 12 24V

-15% -20%

Isolation Voltage

≥ 1500V RMS

Life Electrical

1x10^5

Life Mechanical

1x10^7

Mounting Type

Surface mount with one #10 (M5 x 0.8) screw

Output Contact Type

Isolated relay contacts

Polarity Protection

DC units are reverse polarity protected

Power Consumption Ac

≤ 2VA

Power Consumption Dc

≤ 2W

Protection

Circuitry Encapsulated

Repeat Accuracy

±0.5% or 20ms

Reset Time

≤ 150ms

Terminations

0.25 in. (6.35 mm) male quick connect terminals

Time Delay Vs Temp Voltage

≤ ±5%

Products Detail

The KRDR Series is a compact time-delay relay measuring 2 in. square. It features a solid-state timing circuit for high repeat accuracy and stability, encapsulated construction for protection against shock, vibration, and humidity. It is a cost-effective recycling timer for OEM applications requiring small size, isolation, reliability, and long life. The relay offers adjustable ON and OFF times, isolated SPDT output contacts rated at 10A, and microcontroller-based timing with ±0.5% repeat accuracy.

Key Features

Compact design, adjustable ON and OFF times, repeat accuracy ±0.5%, microcontroller based, isolated 10A SPDT output contacts, encapsulated protection

Application scenarios

OEM applications
control of loads for AC or DC voltages

Documents

Datasheets:

KRDR Series Datasheet

Product FAQ

1. Is KRDR321B4 available for RFQ?

Yes. KRDR321B4 by Littelfuse is available for RFQ. Submit your required quantity and our team will confirm real-time stock, lead time, and volume pricing.

2. Why is there no fixed price for KRDR321B4?

Pricing for KRDR321B4 can vary by order quantity, market availability, date code, packaging, and delivery destination. Request a quote to receive the latest volume pricing.

3. What are the key specifications of KRDR321B4?

KRDR321B4 is a Littelfuse Relays, Contactors & Solenoids with Input Voltage Tolerance 110 120 230V: -20% -10% and Input Voltage Tolerance 12 24V: -15% -20%. Review the product details or submit an RFQ if you need confirmation before purchase.

4. How fast can I get a quote for KRDR321B4?

Our sales team usually responds within 24 hours after receiving your RFQ. The quote may include stock status, unit price, lead time, shipping options, and available alternatives.

5. How soon can KRDR321B4 be shipped?

If stock is confirmed, in-stock parts can usually ship within 1–2 business days. Final lead time depends on quantity, stock source, and delivery destination.

6. Can you suggest alternatives to KRDR321B4?

Yes. If KRDR321B4 is unavailable, obsolete, or does not meet your required lead time, we can help check similar Littelfuse Relays, Contactors & Solenoids parts or compatible alternatives.

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