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Siemens 4EM5203-4CB00 — Line/Load Reactors

Siemens SIDAC 4EM5203-4CB00 Smoothing Choke, 38A DC, 2mH

MPN4EM5203-4CB00

Siemens SIDAC series, smoothing choke (Glaettungsdrossel), 1-phase, 600V DC, 38A max, 2mH, IP00, screw terminals.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

4EM5203-4CB00 specifications
ParameterValue
Type of voltageDC
Type of electrical connection for main current circuitscrew-type terminals
Operating voltage rated value600V
Power loss [W] of the coil30.2W
Power loss [W] of the iron core0.7W
Operating frequency rated value0Hz
Phase number1
Ambient temperature rated value40°C
Depth0.128m
Width0.121m
Height0.131m
Thermal class acc. to IEC 60085B
Rated value34.2A
Energy content1.44W
Protection class IPIP00
Inductivity rated value0.002H
Product function windings in parallel selectableNo

Product details

DC smoothing choke for 38 A bus rails

Its 2 mH inductance at 600 V insulation class (IEC 60085 thermal class B) filters ripple from DC bus lines in drives, power supplies, and converter sections. The 30.2 W coil losses and 0.7 W iron-core losses add up to about 31 W total dissipation at rated load — factor that into your enclosure ventilation budget.

The 38 A maximum is the DC current the choke can carry without saturating the core — exceed it and inductance drops off fast, losing the smoothing effect. At 0 Hz operating frequency, this choke is designed for pure DC — not for AC line filtering or PWM output stages. The 1.44 W energy content is the stored energy at rated current, useful for sizing discharge resistors if the bus is interrupted.

IP00 means no enclosure — mount this inside a panel or cabinet where it's protected from dust and contact. Screw-type terminals accept lugged or ferruled conductors; no spring-cage or push-in here. Dimensions: 0.128 m deep, 0.121 m wide, 0.131 m tall (–). That's roughly a 5-inch cube — allow breathing space around it for the 31 W heat dissipation. No parallel windings option, so it's one path only.

Frequently asked questions

What are the key specifications of 4EM5203-4CB00?

It is a 1-phase DC smoothing choke rated 38 A maximum, 34.2 A continuous, 2 mH inductance, 600 V insulation voltage, IP00 protection, with screw-type terminals. Dimensions are 0.128 m deep, 0.121 m wide, 0.131 m tall.

Where can I buy 4EM5203-4CB00?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Does 4EM5203-4CB00 replace or cross-reference to a miniature circuit breaker like 5SJ3140-7?

No. The 4EM5203-4CB00 is a DC smoothing choke; the 5SJ3140-7 is a 1-pole 40 A AC miniature circuit breaker (MCB) with C-curve tripping. They perform completely different functions — one filters DC ripple, the other protects AC branch circuits. No direct substitution is possible.

MPN
4EM5203-4CB00