HFZ21-250-B DC relay

Characteristic

● Rated 250A contact breaking capacity

● Double insulation,with a dielectric strength of over 3500VAC

● The coil connection has polarity, and the contact load

connection has no polarity

● Epoxy resin encapsulation and sealing structure,capable of

working in explosive or hazardous environments without

oxidation and contamination of coils and contacts

● Small size, light weight

Coil parameters

9～36

≤9

≥5

3.1

3.8（≤100ms）

0.21

about 2.5

23 Contact parameters º

C

1H

≤ 0.5mΩ( 250A )

250A

12~1000VDC

2000A 320 VDC (More than once)

250kW

1A 12VDC

100mA 6VDC

250A(120mm 2 )

Contact form

Contact resistance

Contact rated load

Rated load voltage

Maximum breaking current

Maximum switching power

Minimum load of main contact

Minimum load of auxiliary

contacts

Standard continuous

charged current Contact form

Contact resistance(Ω)

Minimum current(mA)

1H

<0.1

100(6VDC)

RoHS compliant

Auxiliary contact parameters

Short term overload current

Mechanical lifespan

Electrical durability

375A 30min(120mm 2 )

500A 5min(120mm 2 )

625A 2min(120mm 2 )

2x10 5 Times

1 x10 times (250A 1000VAC,

resistive load, breaking at 23℃,

0.6 second on and 5.4 seconds off)

Rated voltage(VDC)

Action voltage(VDC)

Release voltage(VDC)

Coil resistance x(1±7%)Ω

Rated starting current(A)

Rated holding current(A)

Maintain power(W)

Note: If other rated voltages are required, special orders can be placed.

Performance parameter

1000MΩ(1000VDC)

1000MΩ(1000VDC)

3500VAC 1min

3500VAC 1min

Rated voltage(VDC)

Action time(ms)

Release time(ms)

Bounce time(ms)

Impact

Vibration

Temperature range

Humidity range

Lead out form

Weight

External dimensions

Dielectric

Strength

insulation

resistance

Note: The above values are initial values at room temperature.

9～36

≤30

≤10

≤5

98m/s 2

10~500Hz 49m/s 2

-40~85 o

C

5~85%RH

M6 Internal thread/M8 External thread

about 310/330g

80.4x65.5x66.2mm/80.4x65.5x73.8mm

Between contact points

Contact and coil

Between contact points

Between the coil and

the contact point

Hongfa Relay

ISO9001、IATF16949、ISO14001、ISO45001、IECQ QC 080000、ISO/EC 27001 Certified Enterprise 2024 Rev. 1.00

Certification number：AN506141540001

Certification number：2024260304000019

Certification number：E133481

Certification number：R50596357

3

1

Outline drawing

Outline drawing and wiring diagram Unit :mm

Series code

Load voltage

Coil voltage

Contact form

Auxiliary contact form

Form of coil lead out terminal

Load outlet form

Special characteristic number(1)

L: Lead out line B: Lead out cable with connector

250: 250A

1000: 12~1000VDC

B: 9～36 VDC

A: A set of normally open None: No auxiliary contacts

H: A set of normally open

4: External thread installation 5: Internal thread installation

HFZ21 -250/ 1000 -B -H A -L 4 (XXX)

Note: (1) After the customer's special requirements are reviewed by our company, they will be identified in the form of characteristic numbers.

Example of Order Marking

2

XXX: Customer demand(Used when customers have special needs)

Product model

HFZ21-250-B Internal thread

Coil lead wire

(UL3266 20AWG)red(+)

Auxiliary contact lead wire

( UL3266 20AWG )grey

Coil lead wire

(UL3266 20AWG)black(-)

Installation hole torque 5N.

m~6N.

m

2xM6

2xØ5.7

Installation hole torque 2N.

m~3.5N.

m

66.2±0.5

65.5±0.8

68.2±0.25

27±0.4

19.5±0.4

80.4±0.4

8.8 0-0.5

7 +0.8 0

54.3±0.25 2x55.8±0.4 2x300±10 2x300±10 2x4.5±0.5 2x4.5±0.5 2x12.9±0.2

Ø56.7±0.3

Outline drawing

Outline drawing and wiring diagram Unit :mm

3

HFZ21-250-B External thread

Wiring diagram

A1

+1 -2

A2 3 4

Note: A1 and A2 are load terminals with no polarity;

+1. -2 is the coil end, with polarity;

3. 4 is the auxiliary contact end, with no polarity.

Load end torque 8N.

m~10N.

m

2xM8 2xØ5.7

Installation hole torque 2N.

m~3.5N.

m

68.2±0.25

27±0.4

80.4±0.4

Coil lead wire

(UL3266 20AWG) red (+)

Coil lead wire

(UL3266 20AWG) black (-) 19.5±0.4

Auxiliary contact lead wire

(UL3266 20AWG ) grey66.2±0.5

65.5±0.8

54.3±0.25 2x55.8±0.4 73.8 2x18±0.25 2x300±10 2x300±10 2x4.5±0.5 2x4.5±0.5 2x12.9±0.2

Ø56.7±0.3

Remarks:

1. The external dimensions of the product are not marked with dimensional tolerances.

When the external dimensions are ≤ 10mm, the tolerance is ± 0.3mm;

When the external dimensions are between (10~50) mm, the tolerance is ± 0.5mm;

When the external dimensions are ≥ 50mm, the tolerance is ± 0.8mm.

2. L-type: Coil lead wire specification: UL3266,20AWG, black/red, wire length 300mm;

3. L-type: Auxiliary contact lead wire specification: UL3266,20AWG, gray, wire length 300mm.

4

Precautions for use

Performance curve chart

electric current (A)

Current carrying capacity - energization time (250A)

time(s)

External thread

Note: Load external thread M8, thread height 18mm

Nut

Spring washer

relay

Copper bar

Flat washer

Xiamen Hongfa Acoustics Co., Ltd. All rights reserved.

Declaration:

1. This information is for customer reference only. Hongfa has made every effort to ensure the accuracy of the information in

However, errors are inevitable, and L products, specifications, and parameters may change due to product improvements. For spe

and performance of each product involved, please refer to the specifications and samples provided by Hongfa without further n

2. Regarding the application field, it is impossible for Hongfa to evaluate all the performance parameter requirements of rel

application field. Therefore, customers should choose products that match their specific usage conditions. For requirements th

specified, please contact Hongfa for more technical support. Hongfa explicitly declares that the information in this document

only, and the responsibility for product selection is solely borne by the customer.

1. The rated values in the contact parameters are all values under resistive loads. When using inductive loads with L/R>1ms, please install surge

current protection devices for the load. Without taking measures, it may Causing a decrease in electrical lifespan and poor continuity, please consider

sufficient margin space in the design.

2. This relay is a high-voltage DC switching device, which may experience high-temperature failure when it exceeds the specified lifespan and

load capacity in the manual. Therefore, a protective device that can cut off the load in emergency situations should be used Protect the circuit.

As a product with limited lifespan, timely replacement is necessary to ensure safety.

3. Please avoid sticking grease or other foreign objects on the lead out end, and use connecting wires with a size of 120mm 2 or above; When installing

the load end, ensure that the power cord is tightly attached to the lead out end. Please use flat washers, spring washers, and screws Install and tighten

in the mother's order, or use self-locking nuts directly. Contamination of the lead out or incorrect connection sequence may cause severe overheating

and result in melting of the insulation layer of the connecting cable.

4.To prevent loosening during product installation, please use washers. Please control the locking torque within the recommended range. Exceeding

this range may cause damage to the casing. When using screws, make sure to pad The thickness and strength of the circle are sufficient, otherwise it

will deform and break the shell.

Load side installation

Internal thread

relay

Flat washer

Copper bar

Spring washer

screw Combination screw

Note: Load internal thread M6 hole depth 7mm.

Relay installation

Spring washer

Flat washer

Relay installation section

Customer installs the base plate

Combination screw screw

Not es:

1.The upper temperature limit of function

are set for 135 ℃.

2.It is recommended that the upper temperature

limit shall not exceed 135 ℃. when long time

operation.The relay may also fail, if the safe

temperature limit is exceeded.

1

1

10 100 1,000 10,000

10

100

1,000

10,000

100,000

250A Cont.

375A 1800s

500A 300s

625A 120s