diff --git a/docs/changes/newsfragments/5021.improved_driver b/docs/changes/newsfragments/5021.improved_driver
new file mode 100644
index 00000000000..2a43e5c6cce
--- /dev/null
+++ b/docs/changes/newsfragments/5021.improved_driver
@@ -0,0 +1,2 @@
+Added support for AimTTi QL355TP power supply.
+Moved _numOutputChannels lookup table to the class body.
diff --git a/qcodes/instrument_drivers/AimTTi/Aim_TTi_QL355_TP.py b/qcodes/instrument_drivers/AimTTi/Aim_TTi_QL355_TP.py
new file mode 100644
index 00000000000..e60573eec11
--- /dev/null
+++ b/qcodes/instrument_drivers/AimTTi/Aim_TTi_QL355_TP.py
@@ -0,0 +1,9 @@
+from ._AimTTi_PL_P import AimTTi
+
+
+class AimTTiQL355TP(AimTTi):
+    """
+    This is the QCoDeS driver for the Aim TTi QL355TP series power supply.
+    """
+
+    pass
diff --git a/qcodes/instrument_drivers/AimTTi/_AimTTi_PL_P.py b/qcodes/instrument_drivers/AimTTi/_AimTTi_PL_P.py
index f823caa6472..55a4637544a 100644
--- a/qcodes/instrument_drivers/AimTTi/_AimTTi_PL_P.py
+++ b/qcodes/instrument_drivers/AimTTi/_AimTTi_PL_P.py
@@ -214,6 +214,16 @@ class AimTTi(VisaInstrument):
     Tested with Aim TTi PL601-P equipped with a single output channel.
     """
 
+    _numOutputChannels = {
+        "PL068-P": 1,
+        "PL155-P": 1,
+        "PL303-P": 1,
+        "PL601-P": 1,
+        "PL303QMD-P": 2,
+        "PL303QMT-P": 3,
+        "QL355TP": 3,
+    }
+
     def __init__(self, name: str, address: str, **kwargs: Any) -> None:
         """
         Args:
@@ -226,19 +236,10 @@ def __init__(self, name: str, address: str, **kwargs: Any) -> None:
 
         _model = self.get_idn()["model"]
 
-        _numOutputChannels = {
-            "PL068-P": 1,
-            "PL155-P": 1,
-            "PL303-P": 1,
-            "PL601-P": 1,
-            "PL303QMD-P": 2,
-            "PL303QMT-P": 3,
-        }
-
-        if (_model not in _numOutputChannels.keys()) or (_model is None):
+        if (_model not in self._numOutputChannels.keys()) or (_model is None):
             raise NotKnownModel("Unknown model, connection cannot be " "established.")
 
-        self.numOfChannels = _numOutputChannels[_model]
+        self.numOfChannels = self._numOutputChannels[_model]
         for i in range(1, self.numOfChannels + 1):
             channel = AimTTiChannel(self, f"ch{i}", i)
             channels.append(channel)
diff --git a/qcodes/instrument_drivers/AimTTi/__init__.py b/qcodes/instrument_drivers/AimTTi/__init__.py
index 0e0932d9d0a..ffc6aa1bd86 100644
--- a/qcodes/instrument_drivers/AimTTi/__init__.py
+++ b/qcodes/instrument_drivers/AimTTi/__init__.py
@@ -5,6 +5,7 @@
 from .Aim_TTi_PL303QMD_P import AimTTiPL303QMDP
 from .Aim_TTi_PL303QMT_P import AimTTiPL303QMTP
 from .Aim_TTi_PL601_P import AimTTiPL601
+from .Aim_TTi_QL355_TP import AimTTiQL355TP
 
 __all__ = [
     "AimTTiChannel",
@@ -14,5 +15,6 @@
     "AimTTiPL303QMDP",
     "AimTTiPL303QMTP",
     "AimTTiPL601",
+    "AimTTiQL355TP",
     "NotKnownModel",
 ]