ESS20 Electronic Circuit Breaker

Transcription

1 ESS20 Electronic Circuit Breaker How does (selective) protection of loads work with DC 24 V power distribution systems? E-T-A's latest product.

2 The 24V power supply Transformer or switch-mode? The well-proven transformer power supply: simple and robust The new switch-mode power supply: small and light high efficiency Switch-mode power supplies are in the ascendancy.

3 U [V] transformer power supply power P = U x I ~ const The differences Power vs. safety 0 rated current I N overload 2 x I N I [A] transformer power supply power also at overload U [V] rated current switch-mode power supply overload switch-mode power supply safety by disconnection hiccup mode or power boost The switch-mode power supply is safe but automatic loads disconnection may be problematic. 0 I N 1,1 x I N 2 x I N I [A]

4 The power supply One for all distribution AC feed Power supply distribution DC feed AC DC I tot AC 230 V + DC 24 V - power supply for control cabinets common supply feed AC common supply feed DC 24V I tot = I 1 + I I n I L1 I Ln Only one power supply - to serve all loads! I tot = I L1 + + I Ln load 1 sensor Load n sensor

5 Protection distribution AC feed power supply distribution DC feed AC DC I tot I L1 I Ln AC 230 V + DC 24 V - Safety first Reduce fire hazard I tot = I L1 + + I Ln load 1 sensor time t [s] ,1 load n sensor reliable magnetic trip range Protection of the individual load: against short circuit against overload with short and long cables fault indication and switching on of capacitive loads There is a choice of configurations. 0,01 thermal trip range Vielfache von I N

6 time t [s] ,1 0,01 standard trip curve thermal trip range Reliable magnetic trip range Undelayed protection (too?) fast circuit breaker trip performance Fast protection only a low trip current necessary times of I nom but: time t [s] fast trip curve capacitive loads cannot be switched on! reliable magnetric trip range Selectivity reducing operatability! 0,1 0,01 thermal trip range times of I nom

7 U [V] Transformer power supply overcurrent The difference In the event of a failure transformer power supply trip current flows even at reduced 0 I N = 10 A 18 A 2 x I N I [A] voltage switch-mode power supply U [V] Switch-mode power supply voltage dips at all loads 24 Ensuring a reliable power supply: selective protection of loads. 0 I N = 10 A 18 A I [A]

8 The ultimate solution Electronic circuit breaker ESS20 The ESS20 offers selective protection current measurement fault evaluation active current limitation physical isolation t [s] 5 3 passive range no disconnection overload disconnection after 3-5 secs undelayed electronic disconnection, physical isolation after typ. 3 secs ESS20 selectivity and functionality combined 0 I N ~1.1 x I N ~ 1.8 x I N I [A]

9 ON/OFF/reset button (push-push) blade terminals Second-to-none Features and benefits width per unit only 12.5 mm single unit with selectable current ratings manual ON/OFF button potential-free signal contact plug-in mounting utilising power distribution system Module 17plus fail-safe element status indication by LED selector switch for current rating 3 A /6 A Benefits offered by the ESS20: safe connection of capacitive, inductive and resistive loads active current limitation physical isolation clear status indication

10 MCB Auxiliaries + Save Space Quick and easy System performance - 50 %! including auxiliary contacts reliable spring-loaded terminals terminal block for screw terminals available integral signal contacts ESS20 Reduced space requirement Lower cost

11 Module 17plus Selektivität auf Kosten der Funktionalität. Mounting Quick and easy Power distribution system Module 17plus DIN rail mounting spring-loaded terminals busbar supply feed (up to 50A) integral signal contacts easy-to-fit: plug in the ESS20!

12 ESS20 The best possible choice value added for the customer: functions suited to a choice of applications future-oriented general concept E-T-A's latest product.