diff --git a/dynawaltz-dsl/src/main/groovy/com/powsybl/dynawaltz/dsl/models/loads/LoadTwoTransformersTapChangersGroovyExtension.groovy b/dynawaltz-dsl/src/main/groovy/com/powsybl/dynawaltz/dsl/models/loads/LoadTwoTransformersTapChangersGroovyExtension.groovy
index 18bf77353..c7a1b56c1 100644
--- a/dynawaltz-dsl/src/main/groovy/com/powsybl/dynawaltz/dsl/models/loads/LoadTwoTransformersTapChangersGroovyExtension.groovy
+++ b/dynawaltz-dsl/src/main/groovy/com/powsybl/dynawaltz/dsl/models/loads/LoadTwoTransformersTapChangersGroovyExtension.groovy
@@ -21,8 +21,14 @@ import com.powsybl.iidm.network.Network
 @AutoService(DynamicModelGroovyExtension.class)
 class LoadTwoTransformersTapChangersGroovyExtension extends AbstractSimpleEquipmentGroovyExtension {
 
+    private static final BASE_LIB = "LoadTwoTransformersTapChangers"
+
     LoadTwoTransformersTapChangersGroovyExtension() {
-        super("LoadTwoTransformersTapChangers")
+        super(BASE_LIB)
+    }
+
+    protected LoadTwoTransformersTapChangersGroovyExtension(String lib) {
+        super(lib)
     }
 
     @Override
@@ -38,7 +44,7 @@ class LoadTwoTransformersTapChangersGroovyExtension extends AbstractSimpleEquipm
 
         @Override
         LoadTwoTransformersTapChangers build() {
-            isInstantiable() ? new LoadTwoTransformersTapChangers(dynamicModelId, equipment, parameterSetId) : null
+            isInstantiable() ? new LoadTwoTransformersTapChangers(dynamicModelId, equipment, parameterSetId, equipmentConfig.lib) : null
         }
     }
 }
diff --git a/dynawaltz/src/main/java/com/powsybl/dynawaltz/models/loads/LoadTwoTransformersTapChangers.java b/dynawaltz/src/main/java/com/powsybl/dynawaltz/models/loads/LoadTwoTransformersTapChangers.java
index eb17b9c4c..e4bc5f809 100644
--- a/dynawaltz/src/main/java/com/powsybl/dynawaltz/models/loads/LoadTwoTransformersTapChangers.java
+++ b/dynawaltz/src/main/java/com/powsybl/dynawaltz/models/loads/LoadTwoTransformersTapChangers.java
@@ -24,8 +24,8 @@
  */
 public class LoadTwoTransformersTapChangers extends LoadTwoTransformers implements TapChangerModel {
 
-    public LoadTwoTransformersTapChangers(String dynamicModelId, Load load, String parameterSetId) {
-        super(dynamicModelId, load, parameterSetId, "LoadTwoTransformersTapChangers");
+    public LoadTwoTransformersTapChangers(String dynamicModelId, Load load, String parameterSetId, String lib) {
+        super(dynamicModelId, load, parameterSetId, lib);
     }
 
     @Override
diff --git a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/LoadsModelXmlTest.java b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/LoadsModelXmlTest.java
index 094284203..a7acb5640 100644
--- a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/LoadsModelXmlTest.java
+++ b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/LoadsModelXmlTest.java
@@ -60,7 +60,7 @@ private static Stream<Arguments> provideLoads() {
                 Arguments.of("load_one_transformer_dyd", (Function<Network, BlackBoxModel>) n -> new LoadOneTransformer(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LOT")),
                 Arguments.of("load_one_transformer_tap_changer_dyd", (Function<Network, BlackBoxModel>) n -> new LoadOneTransformerTapChanger(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LOTTC")),
                 Arguments.of("load_two_transformers_dyd", (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTT")),
-                Arguments.of("load_two_transformers_tap_changers_dyd", (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformersTapChangers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTTTC"))
+                Arguments.of("load_two_transformers_tap_changers_dyd", (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformersTapChangers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTTTC", "LoadTwoTransformersTapChangers"))
         );
     }
 }
diff --git a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerAutomatonExceptionsXmlTest.java b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerAutomatonExceptionsXmlTest.java
index 3b2ed5133..d1bbe4d0a 100644
--- a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerAutomatonExceptionsXmlTest.java
+++ b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerAutomatonExceptionsXmlTest.java
@@ -62,7 +62,7 @@ private static Stream<Arguments> provideTapChangers() {
                 Arguments.of(TransformerSide.HIGH_VOLTAGE, (Function<Network, BlackBoxModel>) n -> new LoadOneTransformer(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LOT"), "LoadOneTransformer doesn't have a transformer side"),
                 Arguments.of(TransformerSide.NONE, (Function<Network, BlackBoxModel>) n -> new LoadOneTransformerTapChanger(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LOTTC"), "LoadOneTransformerTapChanger already have a tap changer"),
                 Arguments.of(TransformerSide.NONE, (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTT"), "LoadTwoTransformers must have a side connected to the Tap changer automaton"),
-                Arguments.of(TransformerSide.HIGH_VOLTAGE, (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformersTapChangers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTTTC"), "LoadTwoTransformersTapChangers already have a tap changer")
+                Arguments.of(TransformerSide.HIGH_VOLTAGE, (Function<Network, BlackBoxModel>) n -> new LoadTwoTransformersTapChangers(DYN_LOAD_NAME, n.getLoad(LOAD_NAME), "LTTTC", "LoadTwoTransformersTapChangers"), "LoadTwoTransformersTapChangers already have a tap changer")
         );
     }
 }
diff --git a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerBlockingAutomatonXmlTest.java b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerBlockingAutomatonXmlTest.java
index a2be2a032..4ecfc2dc2 100644
--- a/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerBlockingAutomatonXmlTest.java
+++ b/dynawaltz/src/test/java/com/powsybl/dynawaltz/xml/TapChangerBlockingAutomatonXmlTest.java
@@ -44,7 +44,7 @@ protected void setupNetwork() {
     protected void addDynamicModels() {
         dynamicModels.add(new TransformerFixedRatio("BBM_NGEN_NHV1", network.getTwoWindingsTransformer("NGEN_NHV1"), "transformer", "TransformerFixedRatio"));
         dynamicModels.add(new LoadOneTransformerTapChanger("BBM_LOAD", network.getLoad("LOAD"), "lot"));
-        dynamicModels.add(new LoadTwoTransformersTapChangers("BBM_LOAD2", network.getLoad("LOAD2"), "ltt"));
+        dynamicModels.add(new LoadTwoTransformersTapChangers("BBM_LOAD2", network.getLoad("LOAD2"), "ltt", "LoadTwoTransformersTapChangers"));
         dynamicModels.add(new TapChangerBlockingAutomaton("BBM_TapChangerBlocking", "TapChangerPar",
                 network.getTwoWindingsTransformerStream().toList(),
                 List.of(network.getLoad("LOAD"), network.getLoad("LOAD2")),