NFG50DK DC relay

Features

• Fully sealed structure, with a protection level of IP67.

• Small size and light weight.

• Fully complies with ROHS requirements.

• Applicable to electric vehicle pre-charging systems, battery switches and backup power supplies, DC power control, circuit safety protection, etc.

Performance parameters

Coil parameters

Note:

1. The rated electrical life of the product is based on resistive load testing, with a maximum inductance of the load not exceeding 27μH; for inductive loads, please consult the factory.

2. The above figure is drawn based on the estimation of test and inferred data. It is recommended that users conduct tests and confirmations according to the actual usage route.

3. When the dielectric withstand voltage and insulation resistance of the product are less than the parameters listed in the product parameter table, the product is defined as having reached the end of its lifespan.

Model Description

①: Product model

②: Contact voltage: (N: Low voltage; G: High voltage)

③: Rated operating current: "50" = 50A

④: A: Equipped with energy-saving circuit board

⑤: B: One normal close; (None: One normal open)

⑥: C: Magnetic latching

⑦: D: Single coil

⑧: T: Ceramic base

⑨: S: one normal open auxiliary contacts

⑩: Rated voltage of coil: "6" = 6V (DC), "12" = 12V (DC), "24" = 24V (DC), "48" = 48V (DC), "72" = 72V (DC)

⑪: Connection method: (N: external thread; K: internal thread)

⑫: Installation method: (None: bottom installation)

⑬: Customer Special Code: 01-99

Example: NFG50DK/24 indicates that the rated current of the product load is 50A (resistive), the main contact form is one normal open (internal thread), the coil voltage is DC 24V, and the bottom mounting method is used.

Circuit principle

Outline dimension diagram

Precautions for use

• When installing a relay, always use a washer to prevent the screw from loosening.
  The torque range for tightening screws is specified below. Exceeding the maximum torque value may result in product breakage.
  Torque of contact terminal (M5 screw): 3.5-4.5N.m
  Torque at the installation point: 2.3N.m Max
• The contacts of this relay are polarity-free, so when connecting the contacts, please follow the markings on the product's end cap. We recommend installing varistors as surge protectors for models without energy-saving boards, and avoid using diodes as they can reduce the product's cutting-off capability.
• Do not use products that have been dropped.
• Avoid installing the product in a place with a strong magnetic field (near a transformer or magnet) or near objects that emit thermal radiation.
• Electrical life
  This relay is a high-voltage DC switch. In its ultimate breakdown mode, it may lose its intended cutting-off function. Therefore, do not use it in a state that exceeds its switching capacity and lifespan parameters (treat this relay as a product with a specified lifespan and replace it when necessary). Once the relay loses its ability to disconnect and cut off, it may cause the surrounding components to burn. Therefore, design the circuit diagram carefully to ensure that the power supply can be cut off within 1 second.
• Diffusion lifetime of internal gas
  This relay utilizes sealed chamber contacts, with the chamber filled with gas. The diffusion lifespan of the gas is determined by the temperature within the contact chamber (i.e., the ambient temperature plus the temperature rise caused by the energization of the contacts). Therefore, it is essential to ensure that the ambient temperature ranges from -40 to +85℃.
• If the coil and contacts of the relay are continuously subjected to rated voltage (or current), and the power supply is cut off and then immediately reconnected, the temperature of the coil will increase, leading to an increase in coil resistance. This, in turn, will raise the product's pull-in voltage, potentially exceeding the rated pull-in voltage. In such cases, the following measures should be taken: reducing the load current, limiting the continuous energization time, or using a coil voltage higher than the rated pull-in voltage.
• When dealing with resistive loads, the rated parameters of the main contact specified in the rating are applicable. If inductive loads (L loads) are used and L/R > 1 millisecond, a surge current protection device should be connected in parallel with the inductive load.
• The drive circuit power of the product coil must be greater than the product coil power, otherwise it will reduce the cutting ability of the product.
• Be careful not to let debris and oil stains get on the main outgoing terminal, and ensure that the external wiring terminal is in reliable contact with the main outgoing terminal of the product, otherwise it may cause the outgoing terminal to heat up excessively. At the same time, the lead wire connected to the product must have the required conductivity to prevent overheating and affect its lifespan (the cross-sectional area of the lead wire connected to the main contact should be above 10mm2).