diff --git a/src/main/java/de/neemann/digital/core/switching/PlainSwitchDT.java b/src/main/java/de/neemann/digital/core/switching/PlainSwitchDT.java
index 770cf0e6e..64833ff93 100644
--- a/src/main/java/de/neemann/digital/core/switching/PlainSwitchDT.java
+++ b/src/main/java/de/neemann/digital/core/switching/PlainSwitchDT.java
@@ -44,11 +44,11 @@ public final class PlainSwitchDT implements NodeInterface {
 
         if (inA != null && inB != null) {
             inB.addObserverToValue(this).checkBits(bits, null);
-            s1 = PlainSwitch.createSwitchModel(inA, inB, outputA, outputB, true, name+"-A-B");
+            s1 = PlainSwitch.createSwitchModel(inA, inB, outputA, outputB, true, name + "-A-B");
         }
         if (inA != null && inC != null) {
             inC.addObserverToValue(this).checkBits(bits, null);
-            s2 = PlainSwitch.createSwitchModel(inA, inC, outputA, outputC, true, name+"-A-C");
+            s2 = PlainSwitch.createSwitchModel(inA, inC, outputA, outputC, true, name + "-A-C");
         }
     }
 
@@ -77,12 +77,10 @@ public final class PlainSwitchDT implements NodeInterface {
     public void setClosed(boolean isClosed) {
         if (this.closed != isClosed) {
             this.closed = isClosed;
-            if (closed) {
-                if (s1 != null)
-                    s1.setClosed(closed);
-                if (s2 != null)
-                    s2.setClosed(!closed);
-            }
+            if (s1 != null)
+                s1.setClosed(closed);
+            if (s2 != null)
+                s2.setClosed(!closed);
             hasChanged();
         }
     }
diff --git a/src/test/resources/dig/test/switch/highZ-DT2.dig b/src/test/resources/dig/test/switch/highZ-DT2.dig
new file mode 100644
index 000000000..65f8205f0
--- /dev/null
+++ b/src/test/resources/dig/test/switch/highZ-DT2.dig
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="utf-8"?>
+<circuit>
+  <version>1</version>
+  <attributes/>
+  <visualElements>
+    <visualElement>
+      <elementName>VDD</elementName>
+      <elementAttributes/>
+      <pos x="280" y="100"/>
+    </visualElement>
+    <visualElement>
+      <elementName>In</elementName>
+      <elementAttributes>
+        <entry>
+          <string>Label</string>
+          <string>A</string>
+        </entry>
+      </elementAttributes>
+      <pos x="180" y="100"/>
+    </visualElement>
+    <visualElement>
+      <elementName>Ground</elementName>
+      <elementAttributes/>
+      <pos x="220" y="180"/>
+    </visualElement>
+    <visualElement>
+      <elementName>RelayDT</elementName>
+      <elementAttributes>
+        <entry>
+          <string>rotation</string>
+          <rotation rotation="1"/>
+        </entry>
+        <entry>
+          <string>relayNormallyClosed</string>
+          <boolean>true</boolean>
+        </entry>
+      </elementAttributes>
+      <pos x="260" y="160"/>
+    </visualElement>
+    <visualElement>
+      <elementName>Out</elementName>
+      <elementAttributes>
+        <entry>
+          <string>Label</string>
+          <string>Y</string>
+        </entry>
+      </elementAttributes>
+      <pos x="320" y="160"/>
+    </visualElement>
+    <visualElement>
+      <elementName>Testcase</elementName>
+      <elementAttributes>
+        <entry>
+          <string>Testdata</string>
+          <testData>
+            <dataString>A Y
+0 1
+1 Z
+0 1
+1 Z
+</dataString>
+          </testData>
+        </entry>
+      </elementAttributes>
+      <pos x="200" y="200"/>
+    </visualElement>
+  </visualElements>
+  <wires>
+    <wire>
+      <p1 x="260" y="160"/>
+      <p2 x="320" y="160"/>
+    </wire>
+    <wire>
+      <p1 x="180" y="100"/>
+      <p2 x="220" y="100"/>
+    </wire>
+    <wire>
+      <p1 x="280" y="100"/>
+      <p2 x="280" y="120"/>
+    </wire>
+    <wire>
+      <p1 x="220" y="160"/>
+      <p2 x="220" y="180"/>
+    </wire>
+    <wire>
+      <p1 x="220" y="100"/>
+      <p2 x="220" y="120"/>
+    </wire>
+  </wires>
+</circuit>
\ No newline at end of file