Product Brief

VIP1-1B-03 ( B011X0428) is a 3A single-phase leaded EMI power filter rated for 115/250VAC and compatible with 50/60Hz global AC mains power. Adopting mature circuit design, this filter features low leakage current, high insulation resistance and wide working temperature range from -25°C to +100°C. It delivers outstanding attenuation for both common-mode and differential-mode power line noise under the standard 50-ohm test system. It can effectively suppress conducted interference on AC input lines and protect sensitive electronic equipment from power grid noise. The product has passed rigorous high voltage test and supports panel or chassis mounting.

Application & Purpose

Application Scope

Suitable for single-phase AC powered devices including industrial control systems, medical electronics, power supply modules, test and measuring instruments, office automation equipment, communication devices and various commercial electronic products.

Main Functions

1. Suppress conducted EMI noise transmitted through AC power supply lines.
2. Isolate grid interference to protect internal sensitive circuits of the equipment.
3. Restrain noise generated by the equipment itself from feeding back into the public power grid, helping products meet EMC standards such as EN55014 and GB9254.
4. Stabilize power input and improve the long-term operation reliability of electronic systems.
5. 

FAQ (5 New General EMI Filter Questions)

Q1: What is the difference between common mode noise and differential mode noise?

A: Common mode noise appears simultaneously on both live and neutral lines relative to ground. Differential mode noise is interference between live wire and neutral wire. EMI power filters are designed to attenuate both types of noise at the same time.

Q2: What is the impact of leakage current on EMI filters?

A: Leakage current comes from the Y capacitors inside the filter to the ground. Higher leakage current may affect safety. Models with low leakage current are preferred for medical equipment and devices with strict safety requirements.

Q3: Why should the EMI filter be installed close to the equipment power inlet?

A: If the filter is placed far away from the power entry point, the input cable will easily pick up noise again. Short input wires and good grounding of the filter metal housing can maximize noise suppression performance.

Q4: What will happen if the EMI filter works beyond its rated current?

A: Continuous overload will cause overheating of internal components, degrade filter performance and even shorten service life. Users must select filters whose rated current is higher than the maximum continuous operating current of the device.

Q5: Does the EMI filter need a good ground connection?

A: Yes. The noise suppression effect heavily relies on reliable low-impedance grounding. Poor grounding will greatly reduce the filter’s ability to eliminate common-mode noise.