Released 2007
Single phase 250VAC 20A
Low leakage current,Withstand voltage 4,000 VAC
2-stage filter
Warranty Period 5-year

The terminal cover is retracted inside the unit.
DIN rail installation type is option.

Features of NBM-20

Installation compatible with NAM series
Push down type terminal block

Ordering Information and Options

NBM(1)  -  20(2)  -  471(3)  -  (4)  

(1) Model Name
(2) Rated Current
(3) Line to ground capacitor code
  Refer to Product Line-up.
  * When the line to ground capacitor code is different, the attenuation characteristic is
(4) Options
  D:DIN rail installation type
    * The dimensions change when the option is set. Refer to External view.

Product Line-up

Product Name Leakage Current* Line to ground capacitor
(nominal value)
NBM-20-000 5μA/10μA max Not Provided
NBM-20-101 12.5μA/25μA max 100pF
NBM-20-221 25μA/50μA max 220pF
NBM-20-331 37.5μA/75μA max 330pF
NBM-20-471 50μA/100μA max 470pF
  • * Input 125/250VAC 60Hz


Contents Specifications
Rated Voltage AC 1 φ 250V/DC250V
Rated Current 20A
Operating Temperature -40 to +85℃ (Refer to Derating Curve)
Agency Approvals UL1283, CSA C22.2 No.8 (C-UL) , DIN EN60939 VDE0565 Teil3-1,
ENEC (At only AC input)
Others Dimensions (WxHxD) 53x41x92 mm [2.09x1.61x3.62 inches]
(Option: -D refer to external view)
Weight 270g max
Warranty Period 5-year
  • * For further information and how to use, please see in Cosel product catalog.

Circuit Diagram

Derating Curve

Documents Download

Technical Data
  • * For another documents aren't listed, please feel free to contact to a Cosel representative.

Similar Model (Rated Voltage and Current)

Features Model Name Released Catalog
Instruction Manuals
Small size,
Low leakage current type,
1-stage filter
EAM-20 2010 Catalog
Instruction Manuals
Low leakage current type,
1-stage filter
NAM-20 2005 Catalog
Instruction Manuals
Ultra high-attenuation type,
1-stage filter
NAH-20 2006 Catalog
Instruction Manuals
Ultra high-attenuation and broadband,
2-stage filter
NBH-20 2007 Catalog
Instruction Manuals
  • * For further information and how to use, please see in Cosel product catalog.
Table1 Product Status Information
No. Product Status Definition
1 New Product New Product. Recommended for new design.
2 Recommended Recommended for new design.
3 blank Product in mass production
4 NRND Not recommended for new design.
5 To be discontinued PDN (Product Discontinuation Notice) is issued and LTB (Last Time Buy) is under consideration.
6 Discontinued LTB order is no longer available.